七年级下期期中错题巩固集锦
北师大版数学七年级下册期中错题总结
北师大版数学(初一下)错题总结1. 如果互补的两个角有一条共同边,那么这两个角的角平分线所成的角( )。
延伸:两条平行线被第三条直线所截, 设一对同旁内角的平分线的夹角为α, 则下列结论正确的是( )A. ∠α=900B. ∠α<900C. ∠α>900D. 以上结论都不对2. 如图所示A O E 在同一条直线上,OB 平分∠AOC ,∠AOB+∠DOE=90°,那么∠COD 与∠DOE 之间有什么关系?延伸:若一个多边形的内角和是外角和的5倍, 那么这个多边形的内角和等于___________.3. 计算)5()5(7x y y x -÷-= 。
4. 如图, AB//CD//EF, 那么∠BAC+∠ACE+∠CEF=( )5. 如图, ∠ACD 是△ABC 的外角, BE 平分∠ABC, CE 平分∠ACD, 且BE 、CE 交于E 点. 求证: ∠E=21∠A.6. 计算(2+1)(22+1)(24+1)…(22n +1)+1(n 是正整数)7. 计算2009×2007-200828. 强化训练(1)已知a +b =7,ab =10,求a 2+b 2,(a -b )2的值. (2)已知2a -b =5,ab =23,求4a 2+b 2-1的值. (3)已知(a +b )2=9,(a -b )2=5,求a 2+b 2,ab 的值.(4)x 2+2mx +16是完全平方式,则m 的值为 (5)如果x ,y 满足x 减2的绝对值,加(x+y ) 2 等于0,求y 的x 次方9. 如图,有两堵墙,要测量地面上所形成的∠AOB 的度数,但人又不能进入围墙,只能站在墙外。
如何测量(运用本章知识)?(本题13分)B O A 10. )322)(322(+--+b a b a )22363)(22363(d c b a d c b a -+---+11. 已知A=552,B=443,C=334,求A,B,C 的大小关系。
译林英语七年级下册期中复习基础易错题整理
译林英语七年级下册基础易错题整理一、词汇运用1.At midnight, a thief jumped into a modern house __________ /'kwaiətlI/ from the window .2.--Whose e-bikes are there under the tree?--It belongs to those __________/pəustmən/3.Nowadays young people feel proud of themselves when /reiziŋ/smart pets.4. Every year, /'miljənz/ of travellers will try traditional Chinese breakfast dishes when they are in China.5. As the son of God, Jesus christ's teaching was based on love: love of God and love of our /neibəz/6.The (visit ) names are all on this piece of paper.7. (luck), he lost the chance to study in Peking University last year .8. My fathers (40) birthday is coming soon, want to give him a special present.9. When Mother arrived home, she found her favorite glass (break).10. The smart boy looked for a toy car everywhere, including the four ___ (角落) of the room.11.How excited children were to see that the sun rose (在……上面) the sea.12.--Do you need more food?- -No, thanks. There's still (充足) of milk and eggs in the fridge.13.Can you find out some useful (信息) about the3Ist Summer Olympic Games?14.The photo of the________[pəˈlismən]appeared on the Internet. He became famous overnight.15.All the________[ˈvizitəz]clothes are wet now because of the sudden heavy rain.16.Mr. Smith, I think a_______[ˈdʌbl]room is big enough for you couple and your kid.17.The_______[ˈm nid ə]is so hard-working that he will be promoted(升职)soon.18.My______[ˈneib :z]kid is having a good time in Hongmei park.19.--Without the____________(技师)help, we cannot have our computers checked.--Yes, they are really helpful.20.There are nearly a_________(千)students in Grade 7 in our school.21.Shall we go to the__________(宫殿)Museum this summer holiday?22.A lot of___________(信息)we get from the internet is not so useful.23.How___________(luck)the boy was! He fell off the bike and was badly hurt.24.Simon is the___________(12)of all the students in his class in the exam.25.We are going to celebrate my father’s_____________(49)birthday this weekend.26.Many girls dream of having an__________(old)brother to protect(保护)them.27.________/ləukl/ people are kind to visitors.28. It’s about twenty________/’minits/ rid from here to the cinema.29. I can’t find my_________/ki:z/, They are not in my pocket.30. What is Beijing___________/’feiməs/ for?31.Maybe we can go there by___________/’ ʌndəgraund/.32. __________/freʃ/ vegetables are good for our health.33. We all look___________/’fɔ:wəd/ to the summer holiday.34. I plan to visit Sydney________/’ ɔprə/ House this summer.35. Helen has a lovely cat.__________/its/ name is Kitty.36. I don’t know how to get to the___________/həu’telz/.37.It’s about twenty___________(分钟) by bike from here to the cinema.38.Whose__________(明信片) are these?39.It’s a good idea to grow lots of____________(小麦) on the farm.40.How________(不久) are you going to Beijing? In 2 days.41.There is_________(没有什么) to eat in the fridge.42.Among all his________(作品) , I like this one best.43.Would you like to watch plays at___________(剧院) with me?44._________(没有) of us can help to fix the broken bike.45.The____________(双胞胎) bedrooms are on the second floor.46.They come from different_________________(家乡).47.He walks in the classroom_____________(安静的).48.Where___________(其他) would you like to go?49.Why don’t you have some______________(orange)in the glass?50.Shall we go to enjoy Chinese __________(paint) in the museum tomorrow?51.Some foreign people’s hair is____________(gold).52.Whose books are these? _____________(they) are not ___________(we).53.The eggs smell __________(bad). You should smell____________(careful) before cooking.54.There are many____________(west) restaurants in the town.55.April is the __________ (第四) month of a year. Our city is beautiful, especially in this month.56.The __________ (服务员) are busy cleaning up the tables. They all work very hard.57.Are the silk scarves those American __________ (visit)? Tell them about it at once.58.Would you like __________ (某物) to drink or to eat? We get different food and drinks ready.59.We often see __________ (邮递员) ride green bikes to deliver(投递) letters and newspapers.60.The wonderful pictures are these French __________ (艺术家).61.Wendy’s __________(old) sister is an office worker in a big company.62.The last bus left five minutes ago. The children __________(想知道) what they could do.63.Our eyes are the same size from __________ (born).64.Don’t talk in a w__________. Speak loudly.65.The baby cat is only one kilo at b__________.66.Can you tell me one of the __________(事实) about this kind of animal?67.It is dangerous to sleep with the windows __________(开) and TV __________ (开).68.How __________(luck) the man was! He fell off his bike but he didn’t get hurt at all.69.Do you know the capitals of all these __________(country)?70.It’s __________(good) to stay at home than to go outside in such bad weather.71Now, more and more people __________(骑) bikes to keep fit.72.Stop __________(抱怨). That doesn’t help. Please do something right now.73.It’s not __________(那么) cold. Come on, let’s go out and make a snowman.74.Every morning, Miss Smith __________(匆忙) to work after a quick breakfast.二、用所给动词的适当形式填空1.This careful mother always makes her son (not read) in the sun because it's bad for his eyes.2.Don’t make any noise All the students here (prepare) for a listening test .3.Can (fix)the computer as soon as possible help kids a lot?4.--look! Dragonflies are flying low.--It is said that it (rain) when this phenomenon(现象) appears.5.Tom will get a cool toy car as a prize if he (be not) late for class tomorrow.6. Who are you going to invite (try) the new coffee?7.Listen! The songs each__________(sound)quite beautiful.8.--_______there________(be)two parents’ meetings in two months?---Yes, there are.9.The worker is busy________(fix)the broken computer all the year.10.Everyone hopes__________(own)a large house.11.Can’t you seethe dark clouds in the sky? I guess it__________(rain)soon.12.__________(not be)afraid, Mike. I will always be with you.13.There are more and more superstars, like Lu Han and Wang Yuan________(take)part in the TV shows.14.My parents always ask me________(not check)answers with others.15.Was Li Guyi always the last________(sing)in the Spring Festival Gala?16.Look at the photo. Lily with her family__________(lie)on the grass.17.________(stay)healthy, he keeps on exercising every day.18.Hurry up, and you_________(not miss)the most important part of the movie.19.Doing morning exercises______________(help) you keep healthy.20.I am looking forward to_____________(hear) from you soon.21.The old man spends all his free time he can have___________(fish) by the lake.22.I think _____________(Jog) in the park brings us great fun.23.Before_________(buy) the beef, you can taste some.24.I will go shopping if it_________________(not rain) this weekend.25.There_______________(be) two concerts at the theaters this Saturday, aren’t there?26.I saw him with his parents___________(cross) the road and go into that shopping mall.27.Mum always makes me___________(not read) books in the sun.28.You’d better____________(not bring) your mobile phone to the school.29.Look! Each of them______________(have)a comic book in their hands.30.The Greens_____________(plan) to go on holiday in Hawaii at present.31.Every child hopes their parents_______________(stay) at home with them for longer time.32.There are many souvenirs____________(buy) in Sunshine Town.33.He has lots of close friends_____________(chat) with after class.34.The new shopping mall is a good place __________ (shop). You can buy everything there.35.Look! How fast Lily __________(run)! I’m sure she will come first.36.He’s all right. He __________(not need) any help with his Maths.37.Beijing __________(hold) the Winter Olympic Games in 2022.38.Daniel, __________(not look) out of the window in class, will you?39.Two million dollars __________(not be) a small number for Tom’s family.40.-Where’s Stephen? -Oh, he together with his twin brothers __________(sit) on the sofa, watching TV.41.__________(keep) quiet, Simon! We are in the library.42.How long _______ it _______ (take) you to go from your home to school if the metro is in use?43.Sorry, I can’t help you at the moment. I __________ (write) an email to my friend in the UK.44.-When __________ we __________(go) on a picnic? -What about next Sunday?45.Listen! One of the exchange students __________(practise) singing next door.46.There __________(be) a big birthday party at your home tonight, isn’t there?47.It is going to rain. Would you please, as I said before, ________(not go) for a picnic tomorrow?48.Mr. Green __________ (teach) us English after Mr Red leaves.49.When David saw his father coming back, he quickly ran over __________(meet) him.50.When I was young, Dad told me the Earth __________(move) around the Sun.51.Look! What __________(happen) over there? Let’s go and have a look.52.I __________(feel) sick at that moment, but now I’m much better.53.I __________(go) swimming last Sunday, but my mum __________ (not let) me swim again this Sunday.54.Mr Liu __________ (teach) us geography in two weeks.55.Lucy with her classmates ________(be) interested in _________(plan) some interesting things.56.Children, good news! The trip you’re looking forward to __________(come) next Friday!57.I don’t know which Chinese restaurant __________(choose).58.March __________(come) before April. Everybody knows that.59.There __________(be) more shopping malls in the small town in two years, aren’t there?60.If Frank __________(not come) tomorrow, we _________(have) to ask someone else for help.61.Li Lei is asking his uncle, an English teacher, __________(help) him think of an English name.62.The fish __________(get) sick if the water is not clean enough.63.The Smiths __________(plan) a great day out to the park in two days at the moment.三、根据所给中文完成句子翻译1.我每天都看到吉姆径直往前走,然后在第三个路口右拐。
七年级数学下册期中易错题.doc
七年级数学下册期中易错题选择题1.下列语句中正确的个数有( )①过一点有且只有一条直线与已知直线平行。
②在同一平面内,两条直线不平行就垂直。
③如果两条直线都和第三条直线垂直,那么这两条直线互相平行。
④互相垂直的两条线段一定相交。
⑤从直线外一点到这条直线的垂线段,叫做这点到这条直线的距离。
⑥汽车玻璃上雨刷的运动可以看做是平移。
A,0 B,1 C,2 D,3解析:①这里应该说过直线外一点,如果这一点在直线上,就不会平行。
②这个不用讲都知道是错的,如果两直线相交不成90°呢?③这个是很多同学容易犯错的地方,缺少一个前提条件“在同一平面内”。
如果是在空间当中,这个就不成立。
④这个也是最容易犯错的地方,同样缺少一个前提条件“在同一平面内”。
⑤这个考的是垂线段的距离的定义,距离是指垂线段的长度。
⑥这个很容易理解,应该为旋转运动。
答案A2.下列说法中,错误的有( )①√(-9)²平方根是±9;②√3是3的平方根;③-8的立方根为-2;④√4=±2A,1个B,2个C,3个D,4个解析:①√(-9)²表示的是(-9)²的算术平方根,而±9表示的是(-9)²的平方根,这二者是不相等的。
②√3是3的平方根是正确的,但是不能说3的平方根是√3。
③正确。
④错误的原因与①同。
答案B填空题3.如果x轴上的点Q到y轴的距离为6,则点Q 的坐标为( )解析:距离是没有正负之分,但坐标有正负之分。
答案:(6,0)或(-6,0)4.已知直线a平行b,点M到直线a的距离是5cm,到直线b的距离是3cm,那么直线a和直线b之间的距离为( ) 解析:如图答案:8㎝或2㎝5.已知点M(3,2)与点N(x,y)在同一条垂直于x轴的直线上,且点N到x轴的距离为5,那么点N的坐标是( ) 解析:首先明白垂直于x轴的直线的特点,即平行于y,也就是横坐标相等。
根据M点在这直线上得x=3,而N到X 轴的距离为5,所以纵坐标y=5或y=-5。
七年级下期中考试复习题目(易错题)
厦门海金教育七年级半期考试易错题复习1、关于x ,y 的方程ax+by=3-2x 是二元一次方程,则a ,b 满足的调价是__________。
2、已知x ,y ,t 满足234345x t y t=-⎧⎨-=⎩,则x ,y 之间满足的关系是__________3、把方程2x+3y=8,用含y 的代数式表示x ,则___________4、若1(2)x 0m m -+>是一元一次不等式,则m=____________5、已知方程组31631x y a x y a +=+⎧⎨+=-⎩的解满足x+y>0,则a 的取值范围是__________ 65的相反数是_______ 绝对值是_________ 倒数是__________7_________ 算术平方根是的立方根是_________8、已知点A ()p q p +4,4和点B ()22,35--p q 关于x 轴对称,求P=________Q=________若A ,B 关于原点对称P=________Q=________ A 点到到x 的距离是______,到y 轴的距离_________9、已知点A (9m-5,n+3)在x 轴上,求m=________,n=_______,若A 在x+y=0上,则mn 要满足什么关系?10、关于x 的不等式组⎪⎩⎪⎨⎧+>++-<a x x x x 4231)3(32有四个整数解,则a 的取值范围是 _______________11、已知关于x 的不等式组⎩⎨⎧+<-≥-122b a x b a x 的解集为53<≤x ,则a b 的值为 ____________12、关于x 的方程5x-2m=-4-3x 的解x 满足3<x<10,求m 的取值范围13、不等式组⎩⎨⎧>-<+-m x x x 62的解集是4>x ,那么m 的取值范围是__________ 14、已知2a =3b =4c ,且a +b -c =121,则a =_______,b =_______,c =_______. 15、如果不等式组⎩⎨⎧><mx x 5无解,那么m 的取值范围是_______16、求方程组24536x y a x y a +=-⎧⎨+=-⎩的解都为正数,求a 的范围17、关于x 、y 的方程422736x y a x y a-=-⎧⎨+=+⎩的解满足2<x+y<7,求a 的范围18、已知正整数a 满足25423x y a x y +=-⎧⎨-=⎩且y<0<x,求(x+a )(y+a )的值19、已知x 、y 、m 是三个非负实数,满足30234100x y m x y m ++=⎧⎨++=⎩,1、用含m 的代数式表示x 、y 2、求出当m 为何值时s=3x+2y+5m 有最小值?是多少?20、若4a b A -=是a+2的算术平方根,32a B +=是2-b 的立方根,请问你可以求出A+5B 的平方根和立方根吗?21、若方程组2448x my x y +=⎧⎨+=⎩的解是正整数,求m 的值?22、关于x 、y 的方程组22256x y a x y a -=⎧⎨+=-⎩的解x 、y 互为相反数,求a 的值23、关于x 、y 的方程组35723x y m x y m +=+⎧⎨+=⎩的解满足x :y=3:2,求m 的值和方程组的解24、若关于x 的方程m (x-1)=1-n (x-3)有无数多个解?求m+n 的值25、甲乙两个人解同一方程组232Ax By Cx y +=⎧⎨-=-⎩,甲正确的11x y =⎧⎨=-⎩,乙抄错了C ,解得26x y =⎧⎨=-⎩,求ABC 的值?26、当K 为何值是,等式1620a -=中的b 负数27、一辆汽车从A 地驶往B 地,前13的路段为普通公路,其余为高速公路,已知汽车在普通公路上行驶的速度为60km/h 在高速公路上行驶的速度为100km/h ,汽车从A 地到B 地行驶的2.2h ,求高速公路和普通公路各为多少km ?28、2台大收割机和5台小收割机2小时收割3.6公顷,3台大收割机和2台小收割机5小时收割8公顷,求4台大收割机和6台小收割机5小时收割多少公顷?29、初一级学生去某处旅游,如果每辆汽车坐45人,那么有15个学生没有座位;如果每辆汽车坐60人,那么空出1辆汽车。
七年级数学(下)期中复习(易错题.)doc
七年级数学(下)期中复习(易错题)班级:姓名:_________ 考号:___________1.下列说法中,①两条相交直线组成的四个角相等,则两直线垂直。
②两条相交直线组成的四个角中若有一个是直角,则四个角相等。
③两条直线相交,一个角的两个邻补角相等,则这两条直线垂直。
④两条直线相交,一个角与其邻补角相等,则这两条直线垂直,其中正确的有:__________。
2.如图,O是正六边形ABCDEF的中心,与各顶点连线组成的三角形均为等边三角形,图形中可以由△OBC平移得到的有__________。
3.如图,AB∥CD的条件是( )A.∠B=∠D B.∠B+∠D=90°C.∠B+∠D=∠E D.∠B+∠D+∠E=180°4.如图,AB∥CD∥EF,则下列各式中正确的是( )A.∠2+∠3-∠1=180° B.∠l+∠2=∠3C.∠2+∠3+∠1=180° D.∠l+∠3=180°5.对于同一平面内的三条直线a,b, c,给出下列四个论断:①a∥b;②b∥c;③a⊥b;④a ⊥c,请你以其中两个论断为条件,一个论断为结论,组成一个你认为正确的命题:_______________ 6.写出一个平行线的性质定理___________________________,并指出它的题设是___________________________,结论是___________________________。
7.已知∠α=50°,∠β的两边与∠α的两边分别平行,则∠β=____________。
8.若点P(2-a,3a+6)在第三象限,且P点到两坐标轴的距离相等,则P点坐标为_______________。
9.在直角坐标系中,△ABC的三个顶点坐标分别为A(2,-1),B(4,3),C(1,2)则△ABC的面积为________________。
10.点P(2,-3)关于y轴对称点坐标是________________。
七年级下册数学期中考易错点和典型例题
七年级下册期中考易错题和典型题(一) 班级: ________姓名:_____________(二) 第五章1.下图中, 不是同位角的是( )D 12B 21C 21A 212.下面命题中, 是真命题的有( )①两条直线被第三条直线所截, 内错角相等。
②同旁内角互补。
③两直线平行, 同旁内角相等。
④过一点有且只有一条直线与已知直线平行。
⑤对顶角相等。
⑥从直线外一点到这条直线的垂线段, 叫做点到直线的距离。
⑦有一条公共边的角叫做邻补角。
A.1个B.2个C.3个D.4个3、下列四个条件中, ① ② ③ ④ 能判定AB 3、线段AB=5, AB4、已知点P 坐标为(2,3a+6), 且点P 到两坐标距离相等, 求a 的值及P 点坐标。
5.建立直角坐标系: 箭头、x 、y 、原点、单位长度(刻度)(四)第八章1.把方程3x-y=2化为用x 的式子表示y 的形式_________;用y 的式子表示x 的形式_________.2、已知二元一次方程组 的解x 与y 互为相反数, 求m 的值。
已知5家的倍, 求表中的x。
4.某层地产开发公司向中国建设银行贷年利率分别为6%和8%的甲、乙两种款500万, 一年应付利息共34万, 这两种款的数额各是多少5、一列火车从北京出发到达广州大约需要15小时, 火车出发后先按原来的时速匀速行驶8小时后到达武汉, 由于09年世界时速最高铁路武广高铁投入运营, 现在从武汉到广州火车的平均时速是原来的2倍多50公里, 所需时间也比原来缩短4小时, 求火车从北京到武汉的平均时速和提速后武汉到广州的平均时速。
期中必刷真题解答易错60道提升练,七下浙教)七年级数学下册尖子生培优必刷题(原卷版)【浙教版】
【拔尖特训】2022-2023学年七年级数学下册尖子生培优必刷题【浙教版】期中必刷真题03(解答易错60道提升练,七下浙教)一.解答题(共60小题)1.(2022春•兰溪市期中)已知x=6,y=﹣1与x=﹣2,y=﹣5都是方程y=kx+b的解.(1)求k与b的值;(2)当x=2时,求|y|的值.2.(2012春•临海市校级期中)解下列二元一次方程组:(1);(2).3.(2022春•鄞州区校级期中)已知关于x、y的方程组有两组不同的实数解:和.求(1)实数b的取值范围.(2)y1+y2+b(x1+x2)的值.4.(2022春•诸暨市期中)已知方程组,甲正确地解得,而乙粗心地把c看错了,得,试求出a,b,c的值.5.(2021春•萧山区校级期中)已知关于x,y的方程组与有相同的解,求(a+b)2020的值.6.(2021春•拱墅区校级期中)已知关于x,y的方程组,其中a是实数.(1)若x=y,求a的值;(2)若方程组的解也是方程x﹣5y=3的一个解,求(a﹣4)2019的值;(3)求k为何值时,代数式x2﹣kxy+9y2的值与a的取值无关,始终是一个定值,求出这个定值.7.(2020春•金华期中)已知关于x,y的方程组的解满足4x+y=3,求m的值.8.(2022春•北仑区期中)一批防疫物资要运往某地,准备租用汽车运输公司的甲、乙两种货车,已知过去两次租用这两种货车的情况如表:第一次第二次甲种货车辆数(辆)25乙种货车辆数(辆)36累计运货吨数(吨)1738现租用该公司3辆甲种货车及5辆乙种货车一次刚好运完这批防疫物资,如果按每吨付运费80元计算,问这批物资应付运费多少元?9.(2022春•临海市期中)某汽车公司有甲、乙两种货车可供租用,现有批货物要运往某地,货主准备租用该公司货车,已知甲、乙两种货车运货情况如下表:第一次第二次甲种货车(辆)25乙种货车(辆)36累计运货(吨)1328(1)甲、乙两种货车每辆可装多少吨货物?(2)现租用该汽车公司甲种货车3辆,乙种货车4辆,刚好能一次运完这批货物.如果运费按每吨50元计算,那么货主应付运费多少元?10.(2022春•绍兴期中)杂交水稻的发暖对解决世界粮台不足句题有着重大的贡献,某超市购进A、B两种大米销售,其中两种大米的进价、售价如表:类型进价(元/袋)售价(元/袋)A种大米2030B种大米3045(1)该超市在3月份购进小、B两种大米共70袋,进货款恰好为1800元①求这两种大米各购进多少袋;②据3月份的销售统计,两种大米的销售总额为900元,求该超市3月份已售出大米的进货款为多少元.(2)为刺激销量,超市决定在4月份增加购进C种大米作为赠品,进价为每袋10元,并推出两种促销方案.甲方案:“买3袋A种大米送1袋C种大米”:乙方案:“买3袋B种大米送2袋C种大米”若进货款为2100元,4月份超市的购进数量恰好满足上述促销搭配方案,此时购进三种大米各多少袋?11.(2022春•南湖区校级期中)某市甲、乙两个有名的学校乐团,决定向某服装厂购买同样的演出服.如表是服装厂给出的演出服装的价格表:购买服装的套数1~39套(含39套)40~79套(含79套)80套及以上每套服装的价格100元80元60元经调查:两个乐团共75人(甲乐团人数不少于40人),如果分别各自购买演出服,两个乐团共需花费6600元.请回答以下问题:(1)甲、乙两个乐团各有多少名学生?(2)现从甲乐团抽调a人,从乙乐团抽调b人(要求从每个乐团抽调的人数不少于5人),去儿童福利院献爱心演出,并在演出后每位乐团成员向儿童们进行“心连心活动”;甲乐团每位成员负责3位小朋友,乙乐团每位成员负责5位小朋友.这样恰好使得福利院65位小朋友全部得到“心连心活动”的温暖.请写出所有的抽调方案,并说明理由.12.(2022春•鹿城区校级期中)某单位计划购进A,B,C三种型号的礼品(每种型号至少1件),要求C 型号礼品件数是A型号礼品件数的2倍,三种型号礼品的单价如下表:型号A B C单价(元/件)907075设购进x件A型号礼品,y件B型号礼品.(1)根据信息填表:A B C数量(件)x y费用(元)90x(2)①若购买三种型号的礼品总数为100件,共花费7600元,则三种型号的礼品分别购进多少件?②若购买三种型号的礼品共花费5600元,且A,B两种型号的礼品件数之和超过礼品总数的一半,则三种型号的礼品总数为件(直接写出答案).13.(2022春•鄞州区校级期中)某品牌童装专卖店新推出A、B、C三种款式的春装.四月的某个周末的销售量(单位:件)如表:A B C合计周六的销售量y30周日的销售量x2y4x5x+2y合计103y30+5x+2y (1)请根据表格信息,补全表格中的划线部分(用含x、y的代数式表示);(2)已知A款周六的销售量与B款周日的销售量相等,且这个周末C款的销售总量比A、B两款的销售总量还多4件.①求x,y的值;②已知三种款式的单价均为整数且高于100元,A款的单价是B款单价的3倍,如果周六的总销售额为5600元,那么B款式的单价可以是.(写出所有可能的结果)14.(2022春•兰溪市期中)工作人员从仓库领取如图①中的长方形和正方形纸板作侧面和底面,做成如图②的竖式和横式的两种无盖纸盒若干个,恰好使领取的纸板用完.(1)若工作人员领取正方形纸板560张,长方形纸板940张,请问利用领取的纸板做了竖式与横式纸盒各多少个?(2)若工作人员某次领取的正方形纸板数与长方形纸板数之比为1:3,请你求出利用这些纸板做出的竖式纸盒与横式纸盒个数的比值.15.(2022春•上城区校级期中)目前,新型冠状病毒在我国虽可控可防,但不可松懈,建兰中学欲购置规格分别为200mL和500mL的甲、乙两种免洗手消毒液若干瓶,已知购买3瓶甲和2瓶乙免洗手消毒液需要80元,购买1瓶甲和4瓶乙免洗手消毒液需要110元.(1)求甲、乙两种免洗手消毒液的单价.(2)该校在校师生共1000人,平均每人每天都需使用10mL的免洗手消毒液,若校方采购甲、乙两种免洗手消毒液共花费2500元,则这批消毒液可使用多少天?(3)为节约成本,该校购买散装免洗手消毒液进行分装,现需将8.4L的免洗手消毒液全部装入最大容量分别为200mL和500mL的两种空瓶中(每瓶均装满),若分装时平均每瓶需损耗10mL,请问如何分装能使总损耗最小,求出此时需要的两种空瓶的数量.16.(2022春•长兴县期中)“冰墩墩”和“雪容融”分别是北京2022年冬奥会和冬残奥会的吉祥物.2021年十一月初,奥林匹克官方旗舰店上架了“冰墩墩”和“雪容融”这两款毛绒玩具,当月售出了“冰墩墩”200个和“雪容融”100个,销售总额为32000元.十二月售出了“冰墩墩”300个和“雪容融”200个,销售总额为52000元.(1)求“冰墩墩”和“雪容融”的销售单价;(2)已知“冰墩墩”和“雪容融”的成本分别为90元/个和60元/个.为回馈新老客户,旗舰店决定对“冰墩墩”降价10%后再销售,若一月份销售出这两款毛绒玩具的数量与十二月一样,求该旗舰店当月销售的利润.17.(2022春•诸暨市期中)某中学组织初一学生春游,原计划租用45座汽车若干辆,但有15人没有座位;若租用同样数量的60座汽车,则多出一辆,且其余客车恰好坐满.已知45座客车每日租金每辆220元,60座客车每日租金为每辆300元.(1)初一年级人数是多少?原计划租用45座汽车多少辆?(2)可以单独租一种车,也可以同时租两种车,要使每个学生都有座位,怎样租用更合算?(通过计算加以说明)18.(2022春•拱墅区期中)某商场计划用9万元从厂家购进50台电视机.已知该厂家生产三种不同型号的电视机,出厂价分别为A型1500元/台,B型2100元/台,C型2500元/台.(1)若该商场恰好用9万元从该厂家购进50台两种不同型号的电视机,请你研究一下该商场的进货方案;(2)已知该商场销售A型电视机可获利150元/台,销售B型电视机可获利200元/台,销售C型电视机可获利250元/台,在(1)条件下,你将选择哪种方案,使得销售获利最多?19.(2022春•诸暨市期中)临近2022年春节,西安疫情形势较为严峻,对确诊病例所在地区实行区域管控,严格履行疫情防控措施.为防范疫情,某校欲购置规格分别为300mL和500mL的甲、乙两种消毒液若干瓶,已知购买2瓶甲种和1瓶乙种消毒液需要61元,购买3瓶甲种和4瓶乙种消毒液需要154元.(1)求甲、乙两种消毒液的单价;(2)为节约成本,该校购买散装消毒液进行分装,现需将11.2L的消毒液全部装入最大容量分别为300mL 和500mL的两种空瓶中(每瓶均装满),若分装时平均每瓶需损耗20mL,请问如何分能使总损耗最小?求出此时需要的两种空瓶的数量.20.(2022春•萧山区期中)疫情期间为保护学生和教师的健康,某学校储备“抗疫物资”,用19000元购进甲、乙两种医用口罩共计900盒,甲、乙两种口罩的售价分别是20元/盒,25元/盒.(1)求甲、乙两种口罩各购进了多少盒?(2)现已知甲、乙两种口罩的数量分别是20个/盒,25个/盒,按照市教育局要求,学校必须储备足够使用10天的口罩,该校师生共计900人,每人每天2个口罩,问购买的口罩数量是否能满足市教育局的要求?21.(2022春•宁波期中)化简并求值:定义一种新的运算法则:=ad﹣bc,请你化简式子:,若x=2,y=1,请计算上面这个式子的值.22.(2022春•义乌市期中)你会求(a﹣1)(a2012+a2011+a2010+…a2+a+1)的值吗?这个问题看上去很复杂,我们可以先考虑简单的情况,通过计算,探索规律:(a﹣1)(a+1)=a2﹣1(a﹣1)(a2+a+1)=a3﹣1;(a﹣1)(a3+a2+a+1)=a4﹣1;(1)由上面的规律我们可以大胆猜想,得到(a﹣1)(a2012+a2011+a2010+…a2+a+1)=.利用上面的结论,求(2)22013+22012+22011+…22+2+1的值是.(3)求52013+52012+52011+…52+5+1的值.23.(2020春•越城区校级期中)计算或化简:(1)(π﹣2)0+(﹣1)2019•()﹣1(2)982﹣97×99.(3)(x+1)2﹣(x﹣2)(x+2)(4)2a3(3a2﹣5a)+(2a2)3÷a224.(2019春•西湖区校级期中)化简(1)(﹣1)﹣3+(﹣)﹣3•(﹣3)2+(﹣3.14)0.(2)(﹣2a+b)(﹣2a+b).(3)[(2x﹣y)2+(y﹣2x)(2x﹣4y)+(x﹣2y)2]÷(x+y)﹣1.25.(2022春•江干区校级期中)先化简,再求值:(1)(2x+1)(2x﹣1)﹣(2x﹣3)2,其中x=1;(2)已知y2﹣5y+3=0,求2(y﹣1)(2y﹣1)﹣2(y+1)2+7的值.26.(2022春•拱墅区期中)(1)已知a、b满足代数式:|a﹣2|+=0,求代数式(a﹣3b)(3a+2b)﹣2b(5a﹣3b)的值.(2)已知代数式(ax﹣3)(2x+4)﹣x2﹣b化简后,不含x2项和常数项.求a,b的值.27.(2022春•西湖区校级期中)先化简,再求值:3(4m﹣3)2﹣4(﹣2m+3)(2m+3)﹣32m(m2+m﹣1),其中m=﹣.28.(2022春•长兴县期中)图1是一个长为2a、宽为2b的长方形,沿图中虚线用剪刀均分成四块小长方形,然后按图2的形状拼成一个正方形.(1)求图2中的阴影部分的正方形的周长;(2)观察图2,请写出下列三个代数式(a+b)²,(a﹣b)²,ab之间的等量关系;(3)运用你所得到的公式,计算:若m、n为实数,且mn=﹣3,m﹣n=4,试求m+n的值.(4)如图3,点C是线段AB上的一点,以AC、BC为边向两边作正方形,设AB=8,两正方形的面积和S1+S2=26,求图中阴影部分面积.29.(2022春•绍兴期中)两个边长分别为a和b的正方形如图放置(图1),其未叠合部分(阴影)面积为S1;若再在图1中大正方形的右下角摆放一个边长为b的小正方形(如图2),两个小正方形叠合部分(阴影)面积为S2.(1)用含a,b的代数式分别表示S1、S2;(2)若a+b=16,ab=40,求S1+S2的值;(3)当S1+S2=76时,求出图3中阴影部分的面积S3.30.(2022春•西湖区校级期中)(1)请用两种不同的方法表示图中阴影部分的面积和.方法1:;方法2:.(2)请你直接写出三个代数式:(a+b)2,a2+b2,ab之间的等量关系.(3)根据(2)中的等量关系,解决如下问题:①已知m+n=5,m2+n2=20,求mn和(m﹣n)2的值;②已知(x﹣2021)2+(x﹣2023)2=74,求(x﹣2022)2的值.31.(2022春•西湖区校级期中)用四块相同的宽为a,长为b的小长方形,拼成一个“回形”正方形.(1)观察如图,请你用等式表示(a+b)2,(a﹣b)2,ab之间的数量关系:.(2)根据(1)中的结论,如果a+b=,ab=﹣1,求出(a﹣b)2的值.(3)在(2)的条件下,求出a2﹣b2的值.(4)根据以上结论,如果(2021﹣m)2﹣(m﹣2022)2=7,求(2021﹣m)(m﹣2022)的值.32.(2022春•新昌县期中)图①是一个长为m,宽为4n(m>n)的长方形,用剪刀沿图中虚线剪开,把它平均分成形状和大小都一样的四个小长方形,然后按图②那样拼成一个正方形.(1)观察图②,可得:(m+n)2﹣(m﹣n)2=;(2)若m﹣n=7,mn=6,求(m+n)2的值.(3)当(x﹣10)(20﹣x)=8时,求(2x﹣30)2的值.33.(2022春•海曙区期中)数形结合是解决数学问题的一种重要的思想方法,借助图的直观性,可以帮助理解数学问题.(1)请写出图1,图2,图3阴影部分的面积分别能解释的乘法公式.图1 ,图2 ,图3 .(2)用4个全等的长和宽分别为a,b的长方形拼摆成一个如图4的正方形,请你通过计算阴影部分的面积,写出这三个代数式(a+b)2,(a﹣b)2,ab之间的等量关系.(3)根据(2)中你探索发现的结论,计算:当a+b=5,ab=﹣6时,求a﹣b的值.34.(2022春•嵊州市期中)数学活动课上,老师准备了若干个如图1的三种纸片,A种纸片是边长为a的正方形,B种纸片是边长为b的正方形,C种纸片是长为a、宽为b的长方形,并用A种纸片一张,B种纸片一张,C种纸片两张拼成如图2的大正方形.(1)观察图2,请你写出下列三个代数式:(a+b)2,a2+b2,ab之间的等量关系;(2)若要拼出一个面积为(a+2b)(a+b)的矩形,则需要A号卡片1张,B号卡片2张,C号卡片张.(3)根据(1)题中的等量关系,解决如下问题:①已知:a+b=5,a2+b2=11,求ab的值;②已知(x﹣2019)2+(x﹣2021)2=20,求x﹣2020的值.35.(2022春•娄底期中)两个边长分别为a和b的正方形如图放置(图1),其未叠合部分(阴影)面积为S1;若再在图1中大正方形的右下角摆放一个边长为b的小正方形(如图2),两个小正方形叠合部分(阴影)面积为S2.(1)用含a,b的代数式分别表示S1、S2;(2)若a+b=10,ab=20,求S1+S2的值;(3)当S1+S2=30时,求出图3中阴影部分的面积S3.36.(2022春•拱墅区期中)如图,有一个边长为a的大正方形和两个边长为b的小正方形,分别将它们按照图①和图②的形式摆放.(1)用含有a、b的代数式分别表示阴影面积:S1=S2=,S3=.(2)若a+b=10,ab=24,求2S1﹣3S3的值;(3)若S1=12,S2=10,S3=18,求出图③中的阴影部分面积.37.(2021春•余姚市校级期中)若满足(7﹣x)(x﹣4)=2,求(x﹣7)2+(4﹣x)2的值.设7﹣x=a,x﹣4=b,则(7﹣x)(x﹣4)=ab=2,a+b=(7﹣x)+(x﹣4)=3,所以(x﹣7)2+(4﹣x)2=a2+b2=(a+b)2﹣2ab=32﹣2×2=5.(1)若x满足(9﹣x)(x﹣3)=3,求(x﹣9)2+(x﹣3)2的值;(2)如图,已知正方形ABCD的边长为x,E,F分别为AD,DC上的点,且AE=1,CF=4,长方形EMFD的面积是28,分别以MF,DF为边做正方形,求阴影部分面积.38.(2022春•南湖区校级期中)如图,AC∥EF,∠1+∠3=180°.(1)判断AF与DC平行吗?请说明理由;(2)若AC平分∠F AB,EF⊥BE于点E,∠4=80°,求∠BCD的度数.39.(2022春•富阳区期中)如图,已知直线CB∥OA,∠C=∠OAB=100°,点E、F在线段BC上,满足∠FOB=∠FBO=α,OE平分∠COF.(1)OC与AB是否平行?请说明理由.(2)用含有α的代数式表示∠COE的度数;(3)若左右平移线段AB,是否存在∠OEC=∠OBA的可能?若存在,求出此时α的值;若不存在,请说明理由.40.(2022春•海曙区校级期中)(1)如图1,点E在BC上,∠A=∠D,∠ACB+∠BED=180°.①求证:AB∥CD;②若∠B=40°,∠ACB=2∠BCD,则∠A=°;(2)如图2,AB∥CD,BM平分∠EBK,DN平分∠CDE,且BP∥DN,作EG∥BP,若∠PBM=30°,求∠DEB的度数;(3)如图3,AB∥CD,BG平分∠ABE,与∠EDF的平分线交于点H,若∠DEB比∠DHB大60°,则∠DEB的度数为°.41.(2022春•萧山区期中)已知:如图①,点E在AB上,且CE平分ACD,∠1=∠2.求证:AB∥CD.(探究)已知:如图②,点E在AB上,且CE平分∠ACD,AB∥CD求证:∠1=∠2.(应用)如图③,BE平分∠DBC,点A是BD上一点,过点A作AE∥BC交BE于点E,∠ABC:∠BAE=4:5,直接写出∠E的度数.42.(2022春•上城区校级期中)如图,已知C为两条相互平行的直线AB,ED之间一点,∠ABC和∠CDE 的角平分线相交于F.(1)当∠FDC+∠ABC=180°时:①判断直线AD与BC的关系,并说明理由.②若∠ABC=130°,求∠DFB的度数.(2)当∠C=α时,直接写出∠DFB的度数(用含α的代数式表示).43.(2022春•温州期中)如图,已知AE⊥BC,FG⊥BC,∠1=∠2.(1)求证:AB∥CD;(2)若∠3=40°,∠D﹣∠CBD=40°,则∠D=°.(请直接写出答案)44.(2022春•拱墅区期中)如图,已知射线AM∥BN,连接AB,点P是射线AM上的一个动点(与点A不重合),BC和BD分别平分∠ABP和∠PBN,分别交射线AM于点C,D.(1)若∠A=40°时,则∠ABN=度,∠CBD=度.(2)点P在射线AM上运动,若∠A=α,①设∠A的度数为α,问∠CBD与∠A之间有何数量关系?请说明理由.②当点P运动到使∠ACB+∠ABD=180°时,求∠A的度数.45.(2021春•柯桥区期中)已知,直线AB∥DC,点P为平面内一点,连接AP与CP.(1)如图1,点P在直线AB、CD之间,若∠BAP=50°,∠DCP=20°,求∠APC的度数.(2)如图2,点P在直线AB、CD之间,∠BAP与∠DCP的角平分线相交于点K,写出∠AKC与∠APC 之间的数量关系,并说明理由.(3)如图3,点P在直线AB、CD下方,∠BAP与∠DCP的角平分线相交于点K,直接写出∠AKC与∠APC之间的数量关系.46.(2022春•西湖区校级期中)已知:直线AB∥CD,一块三角板EFH,其中∠EFH=90°,∠EHF=60°.(1)如图1,三角板EFH的顶点H落在直线CD上,并使EH与直线AB相交于点G,若∠2=2∠1,求∠1的度数;(2)如图2,当三角板EFH的顶点F落在直线AB上,且顶点H仍在直线CD上时,EF与直线CD相交于点M,试确定∠E、∠AFE、∠MHE的数量关系;(3)如图3,当三角板EFH的顶点F落在直线AB上,顶点H在AB、CD之间,而顶点E恰好落在直线CD上时得△EFH,在线段EH上取点P,连接FP并延长交直线CD于点T,在线段EF上取点K,连接PK并延长交∠CEH的角平分线于点Q,若∠Q﹣∠HFT=15°,且∠EFT=∠ETF,求证:PQ∥FH.47.(2022春•兰溪市期中)如图,已知AB∥CD,P是直线AB,CD间的一点,PF⊥CD于点F,PE交AB于点E,∠FPE=120°(1)∠AEP的度数为.(2)如图2,射线PN从PF出发,以每秒40°的速度绕P点按逆时针方向旋转,当PN垂直AB时,立刻按原速返回至PF后停止运动;射线EM从EA出发,以每秒15°的速度绕E点按逆时针方向旋转至EB后停止运动.若射线PN,射线EM同时开始运动,设运动时间为t秒.①当∠MEP=20°时,求∠EPN的度数;②当EM∥PN时,求t的值.48.(2021春•下城区校级期中)如图,E,G是分别是AB,AC上的点,F,D是BC上的点,连接EF,AD,DG,如果AB∥DG,∠1+∠2=180°.(1)判断AD与EF的位置关系,并说明理由;(2)若DG是∠ADC的平分线,∠2=145°,求∠B的度数.49.(2022春•拱墅区期中)如图,已知点A在EF上,点P,Q在BC上,∠E=∠EMA,∠BQM=∠BMQ.(1)求证:EF∥BC;(2)若∠3+∠4=180°,∠BAF=3∠F﹣20°,求∠B的度数.50.(2022春•拱墅区校级期中)如图,D是BC上一点,DE∥AB,交AC于点E,∠A=∠1.(1)直接写出图中与∠A构成的同旁内角.(2)求证:DF∥AC.(3)若∠BDE+∠CDF=215°,求∠B+∠C的值.51.(2022春•拱墅区校级期中)如图①,E是直线AB,CD内部一点,AB∥CD,连接EA,ED.(1)探究猜想:①若∠A=20°,∠D=40°,则∠AED=°;②猜想图①中∠AED,∠EAB,∠EDC的关系,并说明理由.(2)拓展应用:如图②,射线FE与l1,l2交于分别交于点E、F,AB∥CD,a,b,c,d分别是被射线FE隔开的4个区域(不含边界),其中区域a,b位于直线AB上方,P是位于以上四个区域上的点,猜想:∠PEB,∠PFC,∠EPF的关系(任写出两种,可直接写答案).52.(2022春•椒江区校级期中)已知AB∥CD,∠1=30°,∠2=50°,∠3=60°,求∠4.53.(2014春•乐清市校级期中)如图1,AB∥CD,EOF是直线AB、CD间的一条折线.(1)试证明:∠O=∠BEO+∠DFO.(2)如果将折一次改为折二次,如图2,则∠BEO、∠O、∠P、∠PFC之间会满足怎样的数量关系,证明你的结论.54.(2019春•江北区校级期中)如图1,直线MN与直线AB、CD分别交于点E、F,∠1与∠2互补.(1)试判断直线AB与直线CD的位置关系,并说明理由;(2)如图2,∠BEF与∠EFD的角平分线交于点P,EP与CD交于点G,点H是MN上一点,且GH ⊥EG,求证:PF∥GH;(3)如图3,在(2)的条件下,连接PH,K是GH上一点使∠PHK=∠HPK,作PQ平分∠EPK,问∠HPQ的大小是否发生变化?若不变,请求出其值;若变化,说明理由.55.(2019春•蔡甸区期中)已知:如图所示,∠ABD和∠BDC的平分线交于E,BE交CD于点F,∠1+∠2=90°.(1)求证:AB∥CD;(2)试探究∠2与∠3的数量关系.56.(2021春•南湖区校级期中)为了安全起见在某段铁路两旁安置了两座可旋转探照灯.如图1所示灯A 射线从AM开始顺时针旋转至AN便立即回转,灯B射线从BP开始顺时针旋转至BQ便立即回转,两灯不停交叉照射巡视.若灯A转动的速度是每秒2度,灯B转动的速度是每秒1度.假定主道路是平行的,即PQ∥MN,且∠BAM:∠BAN=3:2.(1)填空:∠BAN=.(2)若灯B射线先转动30秒,灯A射线才开始转动,在灯B射线到达BQ之前,A灯转动几秒,两灯的光束互相平行?(3)如图2,若两灯同时转动,在灯A射线到达AN之前若射出的光束交于点C,过C作∠ACD交PQ 于点D,且∠ACD=126°,则在转动过程中,请求出∠BAC与∠BCD的数量关系是否发生变化?若不变,请求出其数量关系,若改变,请说明理由.57.(2021春•镇海区校级期中)已知AB∥CD,点M、N分别为AB、CD上的点,在AB、CD之间存在一点P满足MP⊥PN.(1)如图1,若∠AMP=α,求∠PNC的度数(用含α的代数式表达).(2)如图2,过点P作PH⊥AB于点H,点E、F在AB上,连接PE、PF、NF,若PE平分∠HPM,PF平分∠HPN,求∠EPF与∠MPN的数量关系.(3)在(2)的条件下,若∠PNF+∠CNF=180°,∠PFN=2∠HPE,求∠EPN的度数.58.(2021春•拱墅区期中)小明同学在完成七年级下册数学第1章的线上学习后,遇到了一些问题,请你帮他解决一下.(1)如图1,已知AB∥CD,则∠AEC=∠BAE+∠DCE成立吗?请说明理由.(2)如图2,已知AB∥CD,BE平分∠ABC,DE平分∠ADC,BE、DE所在直线交于点E,若∠F AD =50°,∠ABC=40°,求∠BED的度数.59.(2022春•萧山区期中)已知AB∥CD,点E在AB上,点G在CD上,点F在直线AB、CD之间,分别连接EF、FG,∠BEF+∠DGF=2∠EFG.(1)如图1,求∠EFG的度数;(2)如图2,若∠BEF的角平分线与FG的延长线交于点M,求证:∠AEF﹣2∠FME=60°;(3)如图3,已知点P在FG的延长线上,点K在CD上,点N在∠PGC内,分别连接NG,NK.若NK∥EF,∠PGN=2∠NGC,请直接写出∠AEF﹣∠GNK的值.60.(2020春•奉化区期中)如图,已知AM∥BN,∠A=58°,点P是射线AM上一动点(与点A不重合),BC、BD分别平分∠ABP和∠PBN,分别交射线AM于点C,D.(1)①∠ABN的度数是度;②∵AM∥BN,∴∠ACB=∠.(2)求∠CBD的度数.(3)当点P运动时,∠APB与∠ADB之间的数量关系是否随之发生变化?若不变化,请写出它们之间的关系,并说明理由;若变化,请写出变化规律.(4)当点P运动到使∠ACB=∠ABD时,∠ABC的度数是.(直接写出结果)。
2020-2021学年牛津译林版英语七年级下册期中综合复习短语句子错题集-Unit1(含答案)
7B牛津英语期中综合复习短语句子错题集-Unit1 过关一.词组默写。
1.住在宫殿/ 城里2.紧邻一家餐馆3.在第五大街4.日本的首都5.跟我的狗玩得开心6.在莫斯科市中心7.在七楼(美)/ 八楼(英)8 .与某人合用/ 分享某物9.在床上(盖着被子)10.看外面的海滩11.在盥洗室洗脸12.聊天最好的地方13.满是鲜花14.在山脚下15.太多,绰绰有余16.邀请某人做某事17.与……确实不同18.在足球场19.为某人捎个口信20.距伦敦15英里二.句子默写。
1.—埃迪,你想住在宫殿里吗?—是的,我想。
2.我有自己的卧室。
(两种)3.法国面积超过26万平方英里。
(两种)4.我希望将来有一天去你家拜访。
5.我可以和丹尼尔通电话吗?6.请问你是谁?7.我是西蒙。
8.有什么事要我转告吗?9.你能让他给我回电话吗?10.太好玩了!11.我和姐姐合用卧室,我们常躺在床上听音乐。
12.—城里有二十家餐馆,哪家是你最喜爱的?第五大街上最大的那家。
13.我和我家人常坐在那里品茶。
三.Reading和Task默写.四.单词默写。
五.课课练错题整理。
七下Unit1 错题集一、选择题(答案写在题号前面)1.What home do you _________? A. live on B. live in C.live D. to live2.Doris ________ on the ________ floor. It’s too high, so she has to take a lift every day.A.live; fortiethB. lives; fortyC. live; fortyD. lives; fortieth3.That boy is Simon. And the girl next to _______ is Amy.A. heB.hisC. himD. he’s4Most of us ______ in our _______ at home after school.A.study, studiesB. study, studyC. studies, studiesD. studies, study5.The garden there _______ many different flowers. A.is B. are C. have D. has6.Where do you live __________, and which city do you want to go____________?A./,/B. in;/C. /;toD. in; to7.________ bad weather! Why ________stay at home?A.What; not toB. How, notC. How, not toD. What, not8. There __________ a talk about homes around the world the day after tomorrow.A. is going to beB. is going to haveC. hasD. will have9.T here is only one apple left. Let’s ________it, ___________?A. share; will youB. share with, shall weC. share, shall weD. share with; will you10. Simon is friendly______ Anna. He does everything he can ___________ her around Beijing.A. to, showB. to, to showC. of, showD. of, to show11. What ___________ your dream home ____________?A. does, lookB. does, likeC. is, likeD. is, look like12.---Where do you live ____? ---I live in a town 15 miles ____ Suzhou.A./; away fromB. /; far away fromC. in; far fromD. in; away from13.---____ is it from your house to the nearest hospital? ---It’s two miles _____.A.How long; awayB. How far; farC. How long; far awayD. How far; away14.Tom, ___ Jack, ____ to school by bus every morning.A.likes; goB. likes; goesC. like; goesD. like; go15.---How long is the bridge in your hometown, Jack? ---It’s ____.A.300-meter-longB. 300-metres longC. 300 meters longD. 300 meter long16.It’s my daughter’s ______ birthday today. She’s _____ years old.A.eighteenth; eighteenB. eighteenth; eighteenthC. eighteen; eighteenthD. eighteen;eighteen17.In our hometown, ____ villagers leave for big cities to look for jobs.A.two hundreds ofB. two hundred ofC. hundreds ofD. two hundreds18.---_____ your hometown like? ---It’s a good place ____.A.How’s; to liveB. How does; livingC. What does; livingD. What’s; to live二、根据句意、所给汉语或首字母写单词。
期中必刷真题01(选择易错60道提升练,七下浙教)七年级数学下册尖子生培优必刷题(原卷版)【浙教版】
【拔尖特训】2022-2023学年七年级数学下册尖子生培优必刷题【浙教版】期中必刷真题01(选择易错60道提升练,七下浙教)一.选择题(共60小题)1.(2022春•鹿城区校级期中)已知,则x+y的值是()A.4B.5C.6D.72.(2022春•萧山区期中)已知,若x﹣y=7,则m的值为()A.1B.﹣1C.2D.﹣23.(2022春•西湖区校级期中)在解关于x,y的方程组时,小明由于将方程①的“﹣”,看成了“+”,因而得到的解为,则原方程组的解为()A.B.C.D.4.(2022春•嘉兴期中)用代入法解方程组时,将方程①代入②中,所得方程正确的是()A.x﹣15x+1=7B.x﹣15x﹣1=7C.x﹣15x﹣5=7D.x﹣15x+5=75.(2022春•嘉兴期中)解关于x,y的方程组可以用①×3﹣②,消去未知数x,也可以用①+②×4消去未知数y,则a,b的值分别为()A.1,﹣2B.﹣1,﹣2C.1,2D.﹣1,26.(2022春•嵊州市期中)对x,y定义一种新运算“※”,规定:x※y=mx+ny(其中m,n均为非零常数),若1※1=4,1※2=3.则2※1的值是()A.3B.5C.9D.117.(2022春•江干区校级期中)由方程组可得x与y的关系式是()A.3x=7+3m B.5x﹣2y=10C.﹣3x+6y=2D.3x﹣6y=28.(2020春•越城区校级期中)已知关于x、y的方程组的解是,则关于x、y的方程组的解是()A.B.C.D.9.(2022春•鹿城区校级期中)《九章算术》中记载:“今有大器五、小器一容三斛:大器一、小器五容二斛,问大小器各容几何?”译文:“今有大容器5个、小容器1个,总容量为3斛;大容器1个、小容器5个,总容量为2斛.问大小容器的容器各是多少斛?”设1个大容器的容积为x斛,1个小容器的容积y斛,则根据题意可列方程组()A.B.C.D.10.(2022春•吴兴区校级期中)某药店以同样的价格卖出同样的口罩和酒精,以下是4天的记录:第1天,卖出13包口罩和7瓶酒精,收入222元;第2天,卖出18包口罩和11瓶酒精,收入327元;第3天,卖出7包口罩和11瓶酒精,收入228元;第4天,卖出23包口罩和20瓶酒精,收入468元,聪明的小方发现这四天中有一天的记录有误,其中记录有误的是()A.第1天B.第2天C.第3天D.第4天11.(2022春•拱墅区期中)从甲地到乙地有一段上坡路与一段平路,如果保持上坡速度为每小时3千米,平路速度为每小时4千米,下坡速度为每小时5千米,那么从甲地到乙地需56分钟,从乙地到甲地需42分钟.问:从甲地到乙地全程是多少千米?小红将这个实际问题转化为二元一次方程组问题,设未知数x、y,已经列出一个方程为,那么另一个方程是()A.B.C.D.12.(2022春•嘉兴期中)要用19张白卡纸做包装盒,准备把这些白卡纸分成两部分,一部分x张做侧面,另一部分y张做底面.已知每张白卡纸可以做侧面2个,或做底面3个,如果5个侧面可以和2个底面做成一个包装盒.依题意列方程组为()A.B.C.D.13.(2022春•慈溪市期中)用如图①中的长方形和正方形纸板作侧面和底面,做成如图②的竖式和横式的两种无盖纸盒.现有m张正方形纸板和n张长方形纸板,如果做两种纸盒若干个,恰好将纸板用完,则m+n的值可能是()A.2019B.2020C.2021D.202214.(2022春•长兴县期中)《九章算术》中的算筹图是竖排的,为看图方便,我们把它改为横排,如图1,图2.图中各行从左到右列出的算筹数分别表示未知数x,y的系数与相应的常数项.把图1所示的算筹图用我们现在所熟悉的方程组形式表述出来,就是,在图2所示的算筹图中有一个图形被墨水覆盖了,如果图2所表示的方程组中x的值为3,则被墨水所覆盖的图形为()A.|B.||C.|||D.||||15.(2022春•拱墅区校级期中)某车间有60名工人生产太阳镜,1名工人每天可生产镜片200片或镜架50个.应如何分配工人生产镜片和镜架,才能使产品配套?设安排x名工人生产镜片,y名工人生产镜架,则可列方程组()A.B.C.D.16.(2021春•北仑区期中)若方程组的解x与y相等,则k的值为()A.3B.2C.1D.不能确定17.(2022春•绍兴期中)关于x,y的二元一次方程(m﹣3)x+(m+2)y=3m﹣4,当m取一个确定的值时就得到一个方程,所有这些方程有一个相同解,则这个相同解是()A.B.C.D.18.(2022春•吴兴区校级期中)如表中给出的每一对x,y的值都是二元一次方程ax﹣by=3的解,则表中m的值为()x0123y31﹣1mA.﹣5B.﹣3C.0D.319.(2022春•杭州期中)已知关于x,y的方程组,以下结论其中不成立是()A.不论k取什么实数,x+3y的值始终不变B.存在实数k,使得x+y=0C.当y﹣x=﹣1时,k=1D.当k=0,方程组的解也是方程x﹣2y=﹣3的解20.(2022春•拱墅区期中)已知关于xy的方程组和的解相同,则(a+b)2022的值为()A.0B.﹣1C.1D.202221.(2022秋•越城区期中)计算的值是()A.3B.C.D.﹣322.(2021春•西湖区校级期中)若x+y=3且xy=1,则代数式(2﹣x)(2﹣y)的值等于()A.2B.1C.0D.﹣123.(2022春•衢州期中)我们知道下面的结论:若a m=a n(a>0,且a≠1),则m=n.设2m=3,2n=6,2p=18,下列关于m,n,p三者之间的关系正确的是()A.m﹣n=p B.m+n=p C.m+p=n D.p+n=m24.(2022春•南湖区校级期中)下列式子中,不能用平方差公式运算的是()A.(﹣x﹣y)(﹣x+y)B.(﹣x+y)(x﹣y)C.(y+x)(x﹣y)D.(y﹣x)(x+y)25.(2022春•衢州期中)在矩形ABCD内,将两张边长分别为a和b(a>b)的正方形纸片按图1,图2两种方式放置(图1,图2中两张正方形纸片均有部分重叠),矩形中未被这两张正方形纸片覆盖的部分用阴影表示,设图1中阴影部分的面积为S1,图2中阴影部分的面积为S2.当AD﹣AB=3时,S2﹣S1的值是()A.3a B.3b C.3a﹣3b D.﹣3a26.(2022春•南湖区校级期中)在矩形ABCD内,将一张边长为a的正方形纸片和两张边长为b的正方形纸片(a>b),按图1,图2两种方式放置(两个图中均有重叠部分),矩形中未被这三张正方形纸片覆盖的部分用阴影表示,设图1中阴影部分的面积为S1,图2中阴影部分的面积为S2,当AD﹣AB=2时,S1﹣S2的值是()A.2a B.2b C.﹣2b+b2D.2a﹣2b27.(2022秋•慈溪市校级期中)如图1,以直角三角形的各边分别向外作正方形,再把较小的两个正方形按图2的方式放置在大正方形内,记四边形ABCD的面积为S1,四边形DCEG的面积为S2.四边形HGFP 的面积为S3,△GEF面积为S4,若知道图中阴影部分的面积,则一定能求出()A.S1B.S2C.S3D.S428.(2022秋•萧山区期中)如右图:下列整式中不能正确表示图中阴影部分的面积的是()A.x2+3(x+2)B.x(x+3)+6C.x(x+3)+2(x+3)D.(x+3)(x+2)﹣2x29.(2022春•鹿城区校级期中)如图,在长方形ABCD中,AB=6,BC=10,其内部有边长为a的正方形AEFG与边长为b的正方形HIJK,两个正方形的重合部分也为正方形,且面积为5,若S2=4S1,则正方形AEFG与正方形HIJK的面积之和为()A.20B.25C.D.30.(2022春•海曙区校级期中)若m,n均是正整数,且2m+1×4n=128,则m+n的所有可能值为()A.2或3B.3或4C.5或4D.6或531.(2022春•鹿城区校级期中)已知a,b,c均为常数,若(x﹣1)2+bx+c=x2﹣ax+16,则a+b+c的值为()A.18B.17C.16D.1532.(2022春•温州期中)用如图所示的正方形和长方形卡片若干张,拼成一个长为3a+2b,宽为a+b的长方形,需要B类卡片()张.A.3B.4C.5D.633.(2022春•江干区校级期中)如图①,现有边长为b和a+b的正方形纸片各一张,长和宽分别为b,a 的长方形纸片一张,其中a<b.把纸片Ⅰ,Ⅲ按图②所示的方式放入纸片Ⅱ内,已知a,b满足b=a,则图②中阴影部分的面积满足的关系式为()A.S1=4S2B.S1=6S2C.S1=8S2D.S1=10S234.(2022春•龙湾区期中)在数学活动课上,一位同学用四张完全一样的长方形纸片(长为a,宽为b,a >b)搭成如图一个大正方形,面积为132,中间空缺的小正方形的面积为28.下列结论中,正确的有()①(a﹣b)2=28;②ab=26;③a2+b2=80;④a2﹣b2=64A.①②③B.①②④C.①③④D.②③④35.(2022春•镇海区校级期中)如图,为了美化校园,某校要在面积为60平方米长方形空地ABCD中划出长方形EBKR和长方形QFSD,若两者的重合部分GFHR恰好是一个边长为3米的正方形,现将图中阴影部分区域作为花圃,若长方形空地ABCD的长和宽分别为m和n,m>n,花圃区域AEGQ和HKCS 总周长为20米,则m﹣n的值为()A.4米B.7米C.5米D.3.5米36.(2022春•杭州期中)若a、b两数互为相反数,且b>a,则以下结论:=﹣1;②ab是非正数;③是负数;④是正数;⑤(a+66)(b+66)可以利用平方差公式计算.其中正确的是()A.③⑤B.①③⑤C.①②③④D.①②③⑤37.(2022春•拱墅区校级期中)已知实数a,b,c满足a+b=ab=c,有下列结论:①若c=5,则a2+b2=15;②若a=3,则b+c=9;③若c≠0,则=﹣;④若c≠0,则(1﹣a)(1﹣b)=.其中结论正确的有()A.①③B.①②④C.①②③D.①③④38.(2022春•龙湾区期中)如图所示的正方形和长方形卡片各有若干张,若要拼成一个长为(a+2b),宽为(2a+b)的长方形,则需要A类,B类,C类卡片各()张A.2,3,2B.2,4,2C.2,5,2D.2,5,439.(2022春•洞头区期中)如图,将一个正方形纸板按图中虚线裁剪切成9块,其中4块是边长为m的大正方形,1块是边长为n的小正方形和4块长为m宽为n的长方形(m>n),若每块长方形的面积是2,n=2m﹣3,则原正方形纸板的边长是()A.B.4C.D.540.(2022春•鄞州区校级期中)有两个正方形A,B,现将B放在A的内部如图甲,将A,B并排放置后构造新的正方形如图乙,若图甲和图乙中阴影部分的面积分别为4和52,则正方形A,B的面积之和为()A.48B.56C.64D.7241.(2022春•洞头区期中)若(x﹣3)(x+1)=x2+mx﹣3,则常数m的值是()A.m=﹣2B.m=2C.m=﹣3D.m=342.(2022春•嘉兴期中)下列多项式的乘法中,不能用平方差公式计算的是()A.(4x﹣3y)(﹣3y﹣4x)B.(a+b﹣c)(﹣c﹣b+a)C.(﹣x+y)(x﹣y)D.(2x2﹣y2)(2x2+y2)43.(2021秋•余姚市期中)木条a、b、c如图用螺丝固定在木板α上且∠ABM=50°,∠DEM=70°,将木条a、木条b、木条c看作是在同一平面α内的三条直线AC、DF、MN,若使直线AC、直线DF达到平行的位置关系,则下列描述错误的是()A.木条b、c固定不动,木条a绕点B顺时针旋转20°B.木条b、c固定不动,木条a绕点B逆时针旋转160°C.木条a、c固定不动,木条b绕点E逆时针旋转20°D.木条a、c固定不动,木条b绕点E顺时针旋转110°44.(2019春•杭州期中)若将一副三角板按如图所示的方式放置,则下列结论正确的是()A.∠1=∠2B.如果∠2=30°,则有AC∥DEC.如果∠2=45°,则有∠4=∠D D.如果∠2=50°,则有BC∥AE45.(2022春•南湖区校级期中)如图,AB∥CD,∠1=∠ABF,CE平分∠DCF,设∠ABE=∠1,∠E=∠2,∠F=∠3,则∠1、∠2、∠3的数量关系是()A.∠1+2∠2+∠3=360°B.2∠2+∠3﹣∠1=360°C.∠1+2∠2﹣∠3=90°D.3∠1+∠2+∠3=360°46.(2022春•南湖区校级期中)小明、小亮、小刚、小颖一起研究一道数学题,如图,BD⊥AC与点D,点E是BC边上的一动点,过E作EF⊥AC与点F,点G在AB上,连DG,GE.小明说:“如果还知道∠GDB=∠FEC,则能得到∠AGD=∠ABC.”小亮说:“如果∠AGD=∠ABC,可得到∠GDB=∠FEC.”则下列判断正确的是()A.小明说法正确,小亮说法错误B.小明说法正确,小亮说法正确C.小明说法错误,小亮说法正确D.小明说法错误,小亮说法错误47.(2022春•温州期中)如图,已知长方形纸片ABCD,点E和点F分别在边AD和BC上,且∠EFC=37°,点H和点G分别是边AD和BC上的动点,现将点A,B,C,D分别沿EF,GH折叠至点N,M,P,K,若MN∥PK,则∠KHD的度数为()A.37°或143°B.74°或96°C.37°或105°D.74°或106°48.(2022春•西湖区校级期中)如图,AB∥CD,PG平分∠EPF,∠A+∠AHP=180°,下列结论:①CD ∥PH;②∠BEP+∠DFP=2∠EPG;③∠FPH=∠GPH;④∠A+∠AGP+∠DFP﹣∠FPG=180°;其中正确结论是()A.①②③④B.①②④C.①③④D.①②49.(2022春•杭州期中)如图所示,在下列四组条件中,不能判定AD∥BC的是()A.∠1=∠2B.∠3=∠4C.∠BAD+∠ABC=180°D.∠BAC=∠ACD50.(2022春•下城区期中)如图,AB∥CD,BF平分∠ABE,且BF⊥DE,垂足为F,则∠ABE与∠EDC 的数量关系是()A.∠EDC﹣∠ABE=90°B.∠ABE+∠EDC=180°C.∠ABE=∠EDC D.∠ABE+∠EDC=90°51.(2022春•镇海区校级期中)一条两边沿互相平行的围巾按图甲所示折叠并将其绘制成图乙,已知∠DAB ﹣∠ABC=20°,且DF∥CG,则3∠DAB+∠ABC=()A.180°B.150°C.160°D.200°52.(2022春•温州期中)已知,EF∥BC,BE∥CF,现将两块直角三角板OAB(∠OAB=45°)和直角三角板OCD(∠OCD=30°)按如图所示放置,直角顶点O重合,点A,D在EF上,若∠1+∠2=70°,∠3:∠4=4:3,则∠DAB的度数为()A.110°B.115°C.120°D.140°53.(2022春•西湖区校级期中)如图,AB∥CD,点E为AB上方一点,FB、CG分别为∠EFG、∠ECD的角平分线,若∠E+2∠G=210°,则∠EFG的度数为()A.140°B.150°C.130°D.160°54.(2021春•嘉兴期中)将一张边沿互相平行的纸条如图折叠后,若边AD∥BC,则翻折角∠1与∠2一定满足的关系是()A.∠1=2∠2B.∠1+∠2=90°C.∠1﹣∠2=30°D.2∠1﹣3∠2=30°55.(2022春•拱墅区期中)如图a∥b,c与a相交,d与b相交,下列说法:①若∠1=∠2,则∠3=∠4;②若∠1+∠4=180°,则c∥d;③∠4﹣∠2=∠3﹣∠1;④∠1+∠2+∠3+∠4=360°,正确的有()A.①③④B.①②③C.①②④D.②③56.(2022春•台州期中)如图,已知直线AB,CD被直线AC所截,AB∥CD,E是平面内CD上方的一点(点E不在直线AB,CD,AC上),设∠BAE=α,∠DCE=β.下列各式:①α+β,②α﹣β,③β﹣α,④180°﹣α﹣β,⑤360°﹣α﹣β中,∠AEC的度数可能是()A.①②③B.①②④⑤C.①②③⑤D.①②③④⑤57.(2022春•西湖区校级期中)如图,两个直角三角形重叠在一起,将其中一个沿点B到点C的方向平移到△DEF的位置,AB=10,DH=4,BC=15,平移距离为6,则阴影部分的面积()A.40B.42C.45D.4858.(2022春•拱墅区校级期中)如图,将直角△ABC沿斜边AC的方向平移到△DEF的位置,DE交BC于点G,BG=4,EF=10,△BEG的面积为4,下列结论:①∠A=∠BED;②△ABC平移的距离是4;③BE=CF;④四边形GCFE的面积为16,正确的有()A.②③B.①②③C.①③④D.①②③④59.(2016春•上城区校级期中)如图,AB∥EF,∠C=90°,则α、β和γ的关系是()A.β=α+γB.α+β+γ=180°C.α+β﹣γ=90°D.β+γ﹣α=180°60.(2022春•椒江区校级期中)如图,结合图形作出了如下判断或推理:①如图甲,CD⊥AB,D为垂足,那么点C到AB的距离等于C、D两点间的距离;②如图乙,如果AB∥CD,那么∠B=∠D;③如图丙,如果∠ACD=∠CAB,那么AD∥BC;④如图丁,如果∠1=∠2,∠D=120°,那么∠BCD=60°.其中正确的个数是()个.A.1B.2C.3D.4。
部编数学七年级下册期中必刷真题02(填空易错60道提升练,七下册人教)【拔尖特训】 (解析版)
【拔尖特训】2022-2023学年七年级数学下册尖子生培优必刷题【人教版】期中必刷真题02(填空易错60道提升练,七下人教)一.填空题(共60小题)1.(2021春•南山区校级期中)命题“平行于同一条直线的两条直线平行”的题设是 两条直线平行于同一条直线 ,结论是这两条直线平行.【分析】命题中的条件是两条直线平行于同一条直线,放在“如果”的后面,结论是这两条直线平行,应放在“那么”的后面.【详解】解:题设为:两条直线平行于同一条直线,结论为:这两条直线平行,故答案为:两条直线平行于同一条直线.【点睛】本题考查了命题与定理的知识,将原命题写成条件与结论的形式,“如果”后面是命题的条件,“那么”后面是条件的结论,解决本题的关键是找到相应的条件和结论,比较简单.2.(2022春•巧家县期中)将含有60°的三角板ABC按如图所示放置(∠CBA=60°),点C在直线HI上,其中∠HCB=35°,分别过点B,A作直线HI的平行线FG,DE,则∠BAD的度数为 25° .【分析】根据平行线的性质与判定可得∠CBA=∠HCB+∠BAD,求得∠BAD=25°,即可求解.【详解】解:∵HI∥BG,HI∥DA,∴BG∥DA,∴∠HCB=∠CBG,∠BAD=∠GBA,∴∠CBA=∠CBG+∠GBA=∠HCB+∠BAD=60°,∵∠HCB=35°,∴∠BAD=60°﹣35°=25°.故答案为:25°.【点睛】本题考查了平行线的性质与判定,掌握平行线的性质与判定是解题的关键.3.(2021秋•玉州区期中)如图,将一张长方形纸条ABCD沿EF折叠,若∠EFG=55°,则∠BGP= 70° .【分析】由长方形的对边平行得到AD与BC平行,利用两直线平行内错角相等得到∠DEF=∠EFG=55°,∠BGP=∠AEP,根据折叠的性质得到∠GEF=∠DEF=55°,根据平角的定义求出∠AEP的度数,即可确定出∠BGP的度数.【详解】解:∵四边形ABCD是长方形,∴AD∥BC,∴∠DEF=∠EFG=55°,∠BGP=∠AEP,由折叠的性质得到∠GEF=∠DEF=55°,∴∠AEP=180°﹣∠DEF﹣∠GEF=70°,∴∠BGP=70°.故答案为:70°.【点睛】此题考查了平行线的性质,折叠的性质以及平角定义,熟练掌握平行线的性质是解本题的关键.4.(2022春•渑池县期中)一副直角三角尺叠放如图1所示,现将45°的三角尺ADE固定不动,将含30°的三角尺ABC绕顶点A顺时针转动至图2位置的过程中,使两块三角尺至少有一组边互相平行.如图3:当∠CAE=15°时,BC∥DE.则∠CAE其余符合条件的度数为 60°或105°或135° .【分析】分四种情况进行讨论,分别依据平行线的性质进行计算即可得到∠CAE的度数,再找到关于A 点中心对称的情况即可求解.【详解】解:如图3,当BC∥DE时,∠CAE=45°﹣30°=15°;如图,当AE∥BC时,∠CAE=90°﹣30°=60°;如图,当DE∥AB(或AD∥BC)时,∠CAE=45°+60°=105°;当DE∥AC时,如图①,∠CAE=45°+90°=135°.综上所述,旋转后两块三角板至少有一组边平行,则∠CAE(0°<∠CAE<180°)其它所有可能符合条件的度数为60°或105°或135°,故答案为:60°或105°或135°.【点睛】本题考查的是平行线的判定与性质,根据题意画出图形,利用平行线的性质及直角三角板的性质求解是解答此题的关键.5.(2018春•兴义市期中)如图,∠PQR=138°.SQ⊥QR于Q,QT⊥PQ于Q,则∠SQT等于 42° .【分析】利用垂直的概念和互余的性质计算.【详解】解:∵∠PQR等于138°,QT⊥PQ,∴∠PQS=138°﹣90°=48°,又∵SQ⊥QR,∴∠PQT=90°,∴∠SQT=42°.故答案是:42°.【点睛】本题是对有公共部分的两个直角的求角度的考查,注意直角的定义和度数.6.(2022春•桓台县期中)如图,直线l1∥l2,若∠1=35°,则∠2﹣∠3= 35° .【分析】过点E作EF∥11,利用平行线的性质解答即可.【详解】解:过点E作EF∥11,∵11∥12,EF∥11,∴EF∥11∥12,∴∠1=∠AEF=35°,∠FEC=∠3,∴∠2﹣∠3=∠AEC﹣∠FEC=∠AEF=35°.故答案为:35°.【点睛】此题考查平行线的性质,关键是作出辅助线,利用数形结合的思想解答.7.(2022春•绵阳期中)如图,AB∥CD,∠A=∠BCD,点E是AB上任意一点(不与A,B重合).下列结论:①AD∥BC,②∠ADB=∠CDB,③∠DEC=∠ADE+∠BCE,④∠ABC=∠AED+∠ADE,⑤ED⊥CD.正确的有 ①③④ .【分析】根据平行线的判定与性质及三角形内角和定理判断求解即可.【详解】解:∵AB∥CD,∴∠A+∠ADC=180°,∵∠A=∠BCD,∴∠ADC+∠BCD=180°,∴AD∥BC,故①正确,符合题意;只有四边形ABCD是菱形时,∠ADB=∠CDB,故②错误,不符合题意;如图,过点E作EM∥BC,则AD∥EM∥BC,∴∠ADE=∠DEM,∠BCE=∠MEC,∵∠DEC=∠DEM+∠MEC,∴∠DEC=∠ADE+∠BCE,故③正确,符合题意;∵AD∥BC,∴∠A+∠ABC=180°,∵∠A+∠AED+∠ADE=180°,∴∠ABC=∠AED+∠ADE,故④正确,符合题意;根据题意,无法证明ED⊥CD,故⑤错误,不符合题意;故答案为:①③④.【点睛】本题考查了平行线的判定与性质,熟练掌握平行线的判定与性质是解题的关键.8.(2022春•烟台期中)如图,一条公路修到湖边时,需要拐弯绕湖而过,第一次拐的角∠A=110°,第二次拐的角∠B=150°,第三次拐的角为∠C,若MA与CN平行,则∠C的度数为 140° .【分析】作BD∥AM,如图,利用平行线的传递性得到BD∥CN,再根据平行线的性质由BD∥AM得到∠ABD=∠A=120°,则∠DBC=40°,然后利用BD∥CN求出∠C.【详解】解:作BD∥AM,如图,∵BD∥AM,AM∥CN,∴BD∥CN,∵BD∥AM,∴∠ABD=∠A=110°,∴∠DBC=150°−110°=40°,∵BD∥CN,∴∠C+∠DBC=180°,∴∠C=180°−40°=140°.故答案为:140°【点睛】本题考查平行线的判定及性质,已知两条直线平行,找截线,才会有同位角、内错角相等,同旁内角互补.如果没有截线,那就要做辅助线,构造截线,本题的解题关键在于作BD∥AM,成功构造出了截线AB和BC.9.(2022春•孝感期中)如图,三角形ABC的边BC在直线MD上,直线HE平行于MD分别交AB,AC于点G,F,则图中共有同旁内角的对数为 4对 .【分析】利用同旁内角的定义,找出同旁内角,数出对数即可得出结论.【详解】解:根据题意得:同旁内角有:∠FGB和∠GBC,∠HGB和∠GBM,∠EFC和∠FCD,∠GFC 和∠FCB,∴共有同旁内角4对.故答案为:4对.【点睛】本题考查了同旁内角的定义,牢记“两条直线被第三条直线所截形成的角中,若两个角都在两直线的之间,并且在第三条直线(截线)的同旁,则这样一对角叫做同旁内角”是解题的关键.10.(2022春•郯城县期中)如图,已知AB,CD相交于点O,OE⊥CD于O,∠AOE:∠BOD=3:2,则∠AOC的度数是 36° .【分析】根据OE⊥CD,所以∠DOE=90°,∠AOE+∠BOD=90°,根据∠AOE:∠BOD=3:2,求出∠BOD,根据对顶角相等求出∠AOC即可.【详解】解:∵OE⊥CD,∴∠DOE=90°,∴∠AOE+∠BOD=90°,∵∠AOE:∠BOD=3:2,∴∠BOD=×90°=36°,∴∠AOC=∠BOD=36°.故答案为:36°.【点睛】本题考查了垂线和对顶角,熟记概念并灵活运用是解题的关键,对顶角成对出现,在相交直线中,一个角的邻补角有两个.邻补角、对顶角都是相对与两个角而言,是指的两个角的一种位置关系.它们都是在两直线相交的前提下形成的.11.(2022春•费县期中)如图,两个直角三角形重叠在一起,将其中一个三角形沿着点B到点C的方向平移到△DEF的位置,AB=8,DH=2,平移距离为4,则阴影部分的面积为 28 .【分析】先判断出阴影部分面积等于梯形ABEH的面积,再根据平移变化只改变图形的位置不改变图形的形状可得DE=AB,然后求出HE,根据平移的距离求出BE=4,然后利用梯形的面积公式列式计算即可得解.【详解】解:∵△ABC沿着点B到点C的方向平移到△DEF的位置,∴△ABC≌△DEF,∴阴影部分面积等于梯形ABEH的面积,由平移的性质得,DE=AB,BE=4,∵AB=8,DH=2,∴HE=DE﹣DH=8﹣2=6,∴阴影部分的面积=×(6+8)×4=28.故答案为:28.【点睛】本题考查了平移的性质,对应点连线的长度等于平移距离,平移变化只改变图形的位置不改变图形的形状,熟记各性质并判断出阴影部分面积等于梯形ABEH的面积是解题的关键.12.(2022春•孝感期中)如图,已知AB∥DE,∠B=60,∠D=150°,则∠BCD= 30° .【分析】首先过点C作CF∥AB,由AB∥DE,即可得AB∥DE∥CF,然后由平行线的性质,即可证得∠BCF与∠DCF的度数,继而求得答案.【详解】解:过点C作CF∥AB,∵AB∥DE,∴AB∥DE∥CF,∴∠BCF=∠B=60°,∠DCF+∠D=180°,∵∠D=150°,∴∠DCF=180°﹣∠DCF=30°.∴∠BCD=∠BCF﹣∠DCF=60°﹣30°=30°.故答案为:30°.【点睛】此题考查了平行线的性质.此题难度不大,注意辅助线的作法,注意数形结合思想的应用.13.(2022春•前进区期中)如图,要使CE∥AB,则需要添加的一个条件是 ∠BCE=∠B .(符合条件一个即可)【分析】根据平行线的判定进行添加条件即可.【详解】解:∵∠BCE=∠B,∴CE∥AB,故答案为:∠BCE=∠B(答案不唯一).【点睛】本题主要考查了平行线的判定,熟练掌握平行线的判定定理是解题的关键.14.(2022春•海州区校级期中)如图,某县积极推进“乡村振兴计划”,要对一段水渠进行扩建.如图,已知现有水渠从A地沿北偏东50°的方向到B地,又从B地沿北偏西20°的方向到C地.现要从C地出发修建一段新渠CD,使CD∥AB,则∠BCD的度数为 110 度.【分析】根据方向角和平行线的性质:内错角相等即可求出.【详解】解:B点在A点的北偏东50°,C点在B点北偏西20°,∴∠ABC=180°﹣50°﹣20°=110°,∵CD∥AB,∴∠BCD=∠ABC=110°,故答案为:110.【点睛】本题考查平行线的性质,利用方位角进行角度的转化计算是解题的关键.15.(2022春•海陵区校级期中)如图,直线AB、CD相交于点O,∠BOC=α,点F在直线AB上且在点O 的右侧,点E在射线OC上,连接EF,直线EM、FN交于点G.若∠MEF=n∠CEF,∠NFE=(1﹣2n)∠AFE,且∠EGF的度数与∠AFE的度数无关,则∠EGF= .(用含有α的代数式表示)【分析】利用三角形外角的性质:三角形的一个外角等于和它不相邻的两个内角和,以及三角形内角和定理求解.【详解】解:∵∠CEF=∠AFE+∠BOC,∠BOC=a,∴∠CEF=α+∠AFE,∵∠MEF=n∠CEF,∴∠MEF=n(α+∠AFE),∴∠EGF=∠MEF﹣∠NFE,∴∠EGF=n(a+∠AFE)﹣(1﹣2n)∠AFE=na+(3n﹣1)∠AFE,∵∠EGF的度数与∠AFE的度数无关,∴3n﹣1=0,即n=,∴∠EGF=,故答案为:.【点睛】此题考查了三角形外角的性质及角度计算,解题的关键是理解∠EGF的度数与∠AFE的度数无关的含义.16.(2022春•鹿邑县期中)如图,直线AB、CD相交于点O,OE⊥CD,OF平分∠BOD,∠AOC=66°,则∠EOF的度数为 123° .【分析】根据角平分线的定义和对顶角相等解答即可.【详解】解:∵∠AOC=66°,∴∠BOD=∠AOC=66°,∵OF平分∠BOD,∴∠BOF=33°,∵OE⊥AB,∴∠EOD=90°,∴∠EOF=90°+33°=123°.故答案为:123°.【点睛】本题主要考查了角的平分线和角的计算,涉及到的角有平角、直角;熟练掌握平角等于180度,直角等于90度,是解答本题的关键.17.(2022春•阜平县期中)如图,在三角形ABC中,点D,F在BC边上,点E在AB边上,点G在AC 边上,EF与GD的延长线交于点H,∠1=∠B,∠2+∠3=180°.(1)EH与AD的位置关系为 EH∥AD ;(2)若∠DGC=58°,且∠H=∠4+10°,则∠H= 34° .【分析】(1)EH∥AD,理由如下:由已知条件,∠1=∠B,根据平行线的判定可得AB∥GD,根据平行线的性质得∠2=∠BAD,等量代换得到∠BAD+∠3=180°,即可得出答案;(2)由平行线的性质得到∠2=∠BAD=∠H,∠DGC=∠BAC=58°,根据角的和差得出∠BAC=∠BAD+∠4=∠H+∠4=58°,再根据∠H=∠4+10°即可得解.【详解】解:(1)EH∥AD.理由如下:∵∠1=∠B,∴AB∥GD,∴∠2=∠BAD,又∵∠2+∠3=180°,∴∠BAD+∠3=180°,∴EH∥AD;故答案为:EH∥AD;(2)由(1)得AB∥GD,∴∠2=∠BAD,∠DGC=∠BAC,∵∠DGC=58°,∴∠BAC=58°,∵EH∥AD,∴∠2=∠H,∴∠H=∠BAD,∴∠BAC=∠BAD+∠4=∠H+∠4=58°,∵∠H=∠4+10°,∴∠4=∠H﹣10°,∴∠H+∠H﹣10°=58°,∴∠H=34°.故答案为:34°.【点睛】此题考查了平行线的判定与性质,熟记“同位角相等,两直线平行”、“同旁内角互补,两直线平行”及“两直线平行,内错角相等”、“两直线平行,同位角相等”是解题的关键.18.(2022春•丰南区期中)如图,一条公路修到湖边时,需拐弯绕湖而过,如果第一次拐弯处的∠A是66°,第二次拐弯处的角是∠B,第三次拐弯处的∠C是153°,这时道路恰好和第一次拐弯之前的道路平行,则∠B= 93° .【分析】过B作BD∥AE,由AE∥CF可知BD∥CF,再根据平行线的性质可求出∠ABD和∠CBD,进而求出∠ABC.【详解】解:过B作BD∥AE,∵AE∥CF,∴BD∥CF,∴∠A=∠ABD=66°,∠DBC+∠C=180°,∵∠C=153°,∴∠DBC=27°,则∠ABC=∠ABD+∠DBC=93°.故答案为:93°.【点睛】本题考查平行线的性质,解题关键是结合图形利用平行线的性质进行角的转化和角的计算.19.(2022春•龙沙区校级期中)如图,在长方形地块内修筑同样宽的两条“相交”的道路,余下部分作绿化,当道路宽为2米时,道路的总面积为 100 平方米.【分析】将“之”字路的水平线平移到上面,竖直线平移到右面,余下部分是一个长方形,得出长和宽即可.【详解】解:平移后绿化地长为(32﹣2)米,宽为(20﹣2)米,∴面积为(20﹣2)×(32﹣2)=18×30=540(平方米),∴道路的总面积=20×32﹣540=100(平方米).故答案为:100.【点睛】本题主要考查了生活中的平移现象,利用平移的性质将绿化地部分组成一个矩形是解题的关键.20.(2022春•织金县期中)一辆汽车经过两次转弯后,行驶的方向与原来的方向保持平行,且行驶方向相同,如果第一次向右拐64°,则第二次拐弯的方向及角度是 向左64° .【分析】画出图形,结合原来的行驶方向和平行线的性质即可得到结果.【详解】解:如图,由题意可得:∠CBE=64°,AB∥CD,∴∠DCF=∠CBE=64°,∴第2次拐弯的方向及角度为向左64°.故答案为:向左64°.【点睛】此题考查了平行线的性质,注意数形结合法的应用,注意掌握两直线平行,同位角相等.21.(2022春•西陵区校级期中)下列命题:①垂线段最短;②平面内过一点有且只有一条直线与已知直线平行;③平面内过一点有且只有一条直线与已知直线垂直;④同位角相等;⑤两点之间线段最短.其中真命题有 ①③⑤ .(只填写序号)【分析】利用垂线段的性质、平行公理、平行线的性质等知识分别判断后即可确定正确的选项.【详解】解:①垂线段最短,正确,是真命题,符合题意;②平面内过直线外一点有且只有一条直线与已知直线平行,故原命题错误,是假命题,不符合题意;③平面内过一点有且只有一条直线与已知直线垂直,正确,是真命题,符合题意;④两直线平行,同位角相等,故原命题错误,是假命题,不符合题意;⑤两点之间线段最短,正确,是真命题,符合题意.故答案为:①③⑤.【点睛】本题考查了命题与定理的知识,解题的关键是了解有关的定义及性质,难度较小.22.(2022春•魏都区校级期中)如图a,已知长方形纸带ABCD,将纸带沿EF折叠后,点C、D分别落在H、G的位置,再沿BC折叠成图b,若∠DEF=72°,则∠GMN= 72 °.【分析】先根据∠DEF=72°求出∠EFC的度数,进可得出∠EFB和∠BFH的度数,根据∠H=90°和三角形的内角和可得∠HMF的度数,再由折叠的性质可得∠GMN.【详解】解:∵AD∥CB,∴∠EFC+∠DEF=180°,∠EFB=∠DEF,即∠EFC=180°﹣72°=108°,∠EFB=72°,∴∠BFH=108°﹣72°=36°.∵∠H=∠D=90°,∴∠HMF=180°﹣90°﹣36°=54°.由折叠可得:∠NMF=∠HMF=54°,∴∠GMN=72°.故答案为:72.【点睛】本题考查的是平行线的性质,由折叠的性质得到角相等是解题关键.23.(2019春•邛崃市期中)探照灯、汽车灯等很多灯具都与平行线有关,如图所示是一探照灯碗的剖面,从位于O点的灯泡发出的两束光线OB,OC,经灯碗反射以后平行射出,其中∠ABO=α,∠BOC=β,则∠DCO的度数是 β﹣α .【分析】过O作直线EF∥AB,则EF∥CD,再由平行线的性质即可得出结论.【详解】解:过O作直线EF∥AB,则EF∥CD,∵AB∥EF,∴∠1=∠ABO=α.∵EF∥CD,∴∠2=∠DCO=β﹣α.故答案为:β﹣α.【点睛】本题考查的是平行线的性质,用到的知识点为:两直线平行,内错角相等.24.(2022春•蒲城县期中)如图,AB⊥BC于点B,DC⊥BC于点C,连接AD,DE平分∠ADC交BC于点E,点F为CD延长线上一点,连接AF,∠BAF=∠EDF,下列结论:①∠BAD+∠ADC=180°;②AF ∥DE;③∠DAF=∠F.正确的有 ①②③ .(填序号)【分析】①证明AB∥CD,可做判断;②根据平行线的判定和性质可做判断;③根据AF∥ED得内错角相等和同位角相等,再由角平分线的定义得∠ADE=∠CDE,从而可做判断.【详解】解:①∵AB⊥BC,DC⊥BC,∴AB∥CD,∴∠BAD+∠ADC=180°,故①正确;②∵AB∥CD,∴∠AFD+∠BAF=180°,∵∠BAF=∠EDF,∴∠AFD+∠EDF=180°,∴AF∥DE,故②正确;③∵AF∥ED,∴∠DAF=∠ADE,∠F=∠CDE,∵DE平分∠ADC,∴∠ADE=∠CDE,∴∠DAF=∠F,故③正确;故答案为:①②③.【点睛】本题主要考查了平行线的判定与性质,平行线的判定是由角的数量关系判断两直线的位置关系,平行线的性质是由平行关系来寻找角的数量关系.25.(2022春•芗城区校级期中)如图,AB∥CD,点E,F在直线AB上(F在E的左侧),点G在直线CD 上,EH⊥HG,垂足为H,P为线段EH上的一动点,连接GP,GF,∠FGH与∠BFG的角平分线交于点Q,且点Q在直线AB,CD之间的区域,下列结论:①∠BEH+∠DGH=90°;②∠BEH+2∠FQG=270°;③若∠PGH=3∠DGH,则3∠BEH+∠PGD=270°;④若∠PGH=n∠DGH,则∠BEH+∠PGD=90°,其中n为正整数.上述说法正确的是 ①②④. (写出所有正确结论的序号).【分析】①过点H作HL∥AB,利用平行线的性质可得∠1=∠BEH,∠2=∠DGH,由∠EHG=∠1+∠2,等量代换可得结论;②根据角平分线的定义∠QFG=∠BFG,∠QGF=∠FGH,由三角形内角和定理得∠FQG=180°﹣∠QFG﹣∠QGF,由①可得∠BEH=90°﹣∠DGH,利用平行线的性质计算即可得出∠BEH+2∠FQG=270°;③设∠DGH=x°,则∠PGH=3∠DGH=3x°,利用①的结论即可求解;④同③可得结论.【详解】解:如图,过点H作HL∥AB,∵EH⊥FG,∴∠EHG=90°,∵AB∥CD,∴HL∥AB∥CD,∴∠1=∠BEH,∠2=∠DGH,∴∠EHG=∠1+∠2=∠BEH+∠DGH=90°,①正确;∵∠FGH与∠BFG的角平分线交于点Q,∴∠QFG=∠BFG,∠QGF=∠FGH,∵∠FQG=180°﹣∠QFG﹣∠QGF,由①可得∠BEH=90°﹣∠DGH,∴∠BEH+2∠FQG=90°﹣∠DGH+2(180°﹣∠QFG﹣∠QGF)=90°﹣∠DGH+360°﹣2∠QFG﹣2∠QGF=450°﹣(∠DGH+∠BFG+∠FGH),∵AB∥CD,∴∠EFG+∠DGF=180°,即∠DGH+∠BFG+∠FGH=180°,∴∠BEH+2∠FQG=450°﹣180°=270°,②正确;③设∠DGH=x°,则∠PGH=3∠DGH=3x°,∴∠PGD=4x°,∵∠BEH+∠DGH=∠BEH+x°=90°,∴4∠BEH+4x°=360°,∴4∠BEH+∠PGD=360°,③错误;④设∠DGH=x°,则∠PGH=n∠DGH=nx°,∴∠PGD=(n+1)x°,∴x=∠PGD,∵∠BEH+∠DGH=∠BEH+x°=90°,∴∠BEH+∠PGD=90°,④正确.故答案为:①②④.【点睛】本题考查的是平行线的性质,角平分线的定义的综合运用,熟练掌握平行线的性质是解题的关键.26.(2022秋•武侯区校级期中)比较: > 4.【分析】比较两数的大小,可以比较两数差与0的大小,差大于0,被减数大于减数,反之,则被减数小于减数.【详解】解:﹣2﹣4=﹣6=﹣,显然>0,∴﹣2>4.故答案为:>.【点睛】本题考查了实数的大小比较,解题的关键是掌握实数的大小比较方法.27.(2022秋•江都区期中)一个正数的两个平方根为a+3和a﹣8,则这个数为 .【分析】根据一个正数有两个平方根且它们互为相反数直接计算求出a的值,然后再根据平方根的的定义求出这个数.【详解】解:由题意得,a+3+a﹣8=0,解得a=,∴a+3=,a﹣8=﹣,∵(±)2=,∴这个数为.故答案为:.【点睛】本题考查了平方根的定义与性质,掌握平方根的定义与性质是解题的关键.28.(2022春•海淀区校级期中)将边长分别为1和2的长方形如图剪开,拼成一个与长方形的面积相等的正方形,则该正方形的边长最接近整数 1 .【分析】根据算术平方根的定义解决此题.【详解】解:设拼成后的正方形的边长为x(x>0).由题意得,x2=2.∴x=≈1.414.∴该正方形的边长最接近整数1.故答案为:1.【点睛】本题主要考查算术平方根,熟练掌握算术平方根的定义是解决本题的关键.29.(2022春•虞城县期中)如果a的平方根是±8,那么= 4 .【分析】根据平方根的定义求得a,根据立方根的定义即可求解.【详解】解:∵a的平方根是±8,∴a=64,∴.故答案为:4.【点睛】本题考查了平方根和立方根的概念和求法,理解、记忆平方根和立方根的概念是解题关键.平方根:如果x2=a,则x叫做a的平方根,记作“±”(a称为被开方数),立方根:如果x3=a,则x 叫做a的立方根,记作“”(a称为被开方数).30.(2022春•船营区校级期中)已知与互为相反数,则的值为 3 .【分析】先根据条件求出x、y之间的关系,再整体变形求解.【详解】解:由题意得:1﹣2x+3y﹣2=0,∴2x+1=3y,∴=3,故答案为:3.【点睛】本题考查了实数的性质,掌握实数的性质是解题的关键.31.(2022秋•鹿城区校级期中)长方形纸片上有一数轴,剪下10个单位长度(从﹣3到7)的一条线段,并把这条线段沿某点折叠,然后在重叠部分某处剪一刀得到三条线段(如图所示).若这三条线段的长度之比为1:2:2,则折痕处对应的点所表示的数可能是 1或2或3 .【分析】先根据题意求出这三条线段的长度,列出所有可能的情况,即可求出折痕处所对应的数.【详解】解:根据题意可设这三条线段的长度分别为x、2x、2x个单位长度,则可列方程得:x+2x+2x=10,解得:x=2,则这三条线段长分别为2、4、4个单位长度,若剪下的第一条线段长为2个单位长度,则折痕处对应的点所表示的数为:﹣3+2+2=1;若剪下的第一条线段长为4个单位长度,第二条线段为2个单位长度,则折痕处对应的点所表示的数为:﹣3+4+1=2;若剪下的第一条线段长为4个单位长度,第二条线段也为4个单位长度,则折痕处对应的点所表示的数为:﹣3+4+2=3;综上所述:折痕处对应的点所表示的数为:1或2或3;故答案为:1或2或3.【点睛】本题主要考查了数轴与线段结合的题型,解题关键是列出这三段线段所有可能排列的顺序.32.(2022秋•莲湖区期中)实数a,n,m,b满足a<n<m<b,这四个数在数轴上对应的点分别为A,N,M,B(如图所示),若BN2=AN•AB,当AB=2时,BN的长度为 ﹣1 .【分析】根据数轴得出BN、AN、BN之间的关系,设未知数列方程求解.【详解】解:由数轴得:AB=AN+BN,设BN=x,则AN=2﹣x,∴x2=2(2﹣x),解得:x=±﹣1,∵x<2,∴x=﹣1,故答案为:﹣1.【点睛】本题考查了实数和数轴,方程思想是解题的关键.33.(2022秋•社旗县期中)学习完“数的开方”后,成成同学画出了如下结构图进行知识梳理,图中A出应填 负数也有立方根 .【分析】填立方根与平方根的不同.【详解】解:平方根只有正数有,应该填负数也有立方根.故答案为:负数也有立方根.【点睛】本题考查了对立方根的认识,了解平方根与立方根的区别是解题的关键.34.(2022秋•瑞安市期中)对于任意实数对(a,b)和(c,d),规定运算“⊗”为(a,b)⊗(c,d)=(ac,bd);运算“⊕”为(a,b)⊕(c,d)=(a+c,b+d).例如(2,3)⊗(4,5)=(8,15);(2,3)⊕(4,5)=(6,8).若(2,3)⊗(p,q)=(﹣4,9),则(1,﹣5)⊕(p,q)= (﹣1,﹣2) .【分析】读懂题意,利用新定义计算,先根据新定义列等式,求出p、q的值,再代入新定义计算.【详解】解:∵(2,3)⊗(p,q)=(﹣4,9),∴2p=﹣4,p=﹣2,3q=9,q=3,∴(1,﹣5)⊕(p,q)=(1,﹣5)⊕(﹣2,3)=(﹣1,﹣2).故答案为:(﹣1,﹣2).【点睛】本题考查了实数运算的新定义,解题的关键是读懂题意,能利用新定义正确的进行计算.35.(2022秋•海曙区期中)长方形ABCD在数轴上的位置如图所示,点B、C对应的数分别为﹣2和﹣1,CD=2.若长方形ABCD绕着点C顺时针方向在数轴上翻转,翻转1次后,点D所对应的数为1;绕D 点翻转第2次;继续翻转,则翻转2022次后,落在数轴上的两点所对应的数中较大的是 3033 .【分析】找出翻转后,落在数轴上的两点所对应的数中较大的数的规律,利用规律解答即可得出结论.【详解】解:翻转1次后,落在数轴上的两点所对应的数中较大的数为1,翻转2次后,落在数轴上的两点所对应的数中较大的数为2,翻转3次后,落在数轴上的两点所对应的数中较大的数为4,翻转4次后,落在数轴上的两点所对应的数中较大的数为5,翻转5次后,落在数轴上的两点所对应的数中较大的数为7,翻转6次后,落在数轴上的两点所对应的数中较大的数为8,•,翻转偶数次后,落在数轴上的两点所对应的数中较大的数为3的倍数,即:翻转2n次后,落在数轴上的两点所对应的数中较大的数为3n﹣1,∵2022÷2=1011,∴翻转2022次后,落在数轴上的两点所对应的数中较大的是1011×3﹣1=3032,故答案为:3032.【点睛】本题主要考查了数轴的简单应用,找出翻转后,落在数轴上的两点所对应的数中较大的数的规律是解题的关键.36.(2022秋•萧山区期中)已知的整数a,小数部分b,则a= 2 ,2a﹣b= .【分析】先估算6﹣的范围,再确定它的整数a和小数部分b,最后代入计算2a﹣b.【详解】解:∵<<,即3<<4,∴﹣4<﹣<﹣3,∴6﹣4<6﹣<6﹣3,即2<6﹣<3.∴a=2,b=6﹣﹣2=4﹣.∴2a﹣b=2×2﹣(4﹣)=4﹣4+=.故答案为:2,.【点睛】本题考查了实数的比较和计算,掌握估算实数大小的方法、实数的计算法则是解决本题的关键.37.(2022春•启东市期中)对于任意两个正数x和y,规定x⊕y=,例如,4⊕1=﹣1=1.请计算(5⊕2)﹣(5⊕3)= 2﹣5 .【分析】利用规定x⊕y的运算法则分别计算5⊕2和5⊕3后,再利用实数的运算法则运算即可.【详解】解:∵5⊕2=﹣2,5⊕3=3﹣,∴(5⊕2)﹣(5⊕3)=(﹣2)﹣(3﹣)=﹣2﹣3+=2﹣5,故答案为:2﹣5.【点睛】本题主要考查了实数的运算,本题是新定义型,理解新定义的规定并熟练应用是解题的关键.38.(2022春•翔安区期中)如图是一个无理数生成器的工作流程图,根据该流程图,下面说法:①当输出值y为时,输入值x为2或4;②当输入值x为9时,输出值y为;③对于任意的正无理数y,都存在正整数x,使得输入x后能够输出y;④存在这样的正整数x,输入x之后,该生成器能够一直运行,但始终不能输出y值.其中正确的是 ②④ .【分析】通过特殊值法排除①;把x=9代入流程图判断②;通过特殊值法排除③;当x=1时判断④.【详解】解:①当x=16时,=4,=2,=,输出值y为,故①不符合题意;②=3,=,输出值y为,故②符合题意;③当x=π2时,=π,π是正无理数,输出值y为π,故③不符合题意;④当x=1时,=1,该生成器能够一直运行,但始终不能输出y值,故④符合题意;故答案为:②④.【点睛】本题考查了无理数,算术平方根,掌握无理数常见的三种类型:(1)开不尽的方根,如,等;(2)特定结构的无限不循环小数,如0.303 003 000 300 003…(两个3之间依次多一个0);(3)含有π的绝大部分数,如2π是解题的关键.39.(2022春•瑶海区期中)若记[x]表示任意实数的整数部分,例如:[4.2]=4、[]=1、…,则[]﹣[]+[]﹣[]+……+[]﹣[](其中“+”、“﹣”依次相间)的值为 ﹣3 .【分析】利用题干中的规定依次得到各数的整数部分,计算即可得出结论.【详解】解:原式=1﹣1+1﹣2+2﹣2+2﹣2+3﹣3+•+7﹣7=﹣3.故答案为:﹣3.【点睛】本题主要考查了算术平方根的意义,本题是阅读型题目,理解新规定并熟练应用是解题的关键.40.(2022春•孝义市期中)定义一种新运算:对于任意实数a,b,都有a※b=(a﹣1)2+b2,则(+1)2※(﹣)= 15+8 .【分析】先根据新运算的规定把要计算的式子写成实数的运算形式,再利用完全平方公式计算.【详解】解:(+1)2※(﹣)=[()2﹣1]2+(﹣)2=(2+2+1﹣1)2+3=(2+2)2+3=4+8+8+3=15+8.【点睛】本题主要考查了实数的运算,理解新运算的规定是解决本题的关键.41.(2022春•牡丹江期中)已知a是的整数部分,b是的小数部分,则(﹣a)3+(b+2)2= 0 .【分析】根据4<8<9,开方求出的整数部分,表示出小数部分,确定出a与b的值,代入所求式子计算即可求出值.【详解】解:∵4<8<9,∴2<<3,∴的整数部分a=2,小数部分b=﹣2,则原式=﹣8+8=0.故答案为:0【点睛】此题考查了估算无理数的大小,解题关键是确定无理数的整数部分与小数部分.42.(2022春•哈巴河县期中)若一个正数的平方根是m+3和2m﹣15,n的立方根是﹣2,则﹣n+2m的算术平方根是 4 .【分析】首先根据平方根的定义,求出m值,再根据立方根的定义求出n,代入﹣n+2m求值后,再求出这个值的算术平方根即可.【详解】解:∵一个正数的两个平方根分别是m+3和2m﹣15,∴(m+3)+(2m﹣15)=0,解得:m=4,∵n的立方根是﹣2,∴n=﹣8,把m=4,n=﹣8代入﹣n+2m=8+8=16,∵42=16,。
七年级下期中考试英语试题-七年级下册单元重难点易错题精练(外研版)
班级姓名学号分数2021-2022学年七年级下学期期中考试英语试题(时间:100分钟,满分:100分)第一部分选择题一、单项选择(本大题共15小题,每小题1分,共15分)1.Langlang is ______ famous pianist. He plays ______ piano very well.A.the; /B.a; the C.an; /D.the; a 2.— Is this ______ bike?— No, it isn’t. _______ is at home.A.you; me B.your; my C.yours; mine D.your; mine 3.— May I ________ the silk dress?— Of course, it looks nice and I’m sure you’ll like it.A.look for B.pay for C.put away D.try on 4.Kobe is a great basketball player. He has ____________ fans in our school. A.hundred B.hundreds ofC.five hundreds of D.hundred of5.We don’t have ________ meat for dinner. Let’s buy ________ chicken.A.some; some B.some; any C.any; any D.any; some 6.My mum can English very well. Now she’ s a story to my little brother.A.talk; saying B.speak; telling C.tell; talking D.say; speaking 7.There ________ a football match in the playground this afternoon.A.is going to have B.is going to C.is going to be D.will have 8.The children decide ____ their school yard this Friday afternoon.A.clean B.to clean C.cleaning D.cleaned 9.--- Our team_______the match. We've got the first place!--- Well done! Congratulations!A.hit B.beat C.won D.watched 10.— Mum, I want to wear my brown gloves, but there is only one.— Wear _________ pair if you can’t find _________ one, please.A.other;another B.another;the otherC.the other;the other D.another;other11.—Do _________ like going to ___________?—I don’t know.A.woman teachers, clothes shops B.women teachers, clothes shops C.woman teachers, sport shops D.women teachers, vegetables shops 12.He has to ________ 20 yuan on this book. But I only ________ ten yuan for it. A.pay; spend B.cost; payC.take; spend D.spend; pay13.The moonlight goes ____ the window and makes the room bright.A.across B.through C.over D.in 14.Steven, we should ______ the bus at the next stop.A.get up B.get offC.get to D.get in15.--- Could you tell me the way to the post office?--- ________.A.Yes, I could B.Go awayC.No problem D.Yes, please二、完型填空(本大题共10小题,每小题1分,共10分)Hi, everybody! Welcome to Taiwan! Now I would like to show you___16___this island (岛). After that, you will find that it is as beautiful as many___17___places in our country.Do you know anything about the Sun Moon Lake? You___18___ask why people call it so. If you fly high up___19___the lake and look down from the plane, you will find the answer by yourself. In the middle of this lake, there is a small island. People call it Pearl Island (珍珠岛) because it___20___like a pearl. On one side of Pearl Island, the lake is like the sun and on the other side it is like the moon. That is___21___people call the lake the Sun Moon Lake.There are many mountains around this lake. The Ali Mountain is near the Sun Moon Lake. We will camp there___22___three days. You can also have a dance party with the local people. You can climb the mountain and watch the sun___23___slowly in the west. Of course, you can___24___early and enjoy the beautiful sunrise (日出) in the morning. Now, do you think Taiwan is a wonderful place____25____?16.A.above B.over C.of D.around 17.A.other B.the other C.else D.others 18.A.want B.may C.can D.need 19.A.on B.in C.over D.past 20.A.sounds B.looks C.sees D.watches 21.A.when B.why C.what D.where 22.A.for B.with C.in D.till 23.A.raise B.go down C.fly away D.go up 24.A.put up B.set up C.look up D.get up 25.A.to visit B.visit C.visits D.visiting三、阅读单选(本大题共10小题,每小题2分,共20分)AThere are many new ways of shopping , and online shopping is one of them. You can buy almost everything on the Internet, and it’s very easy. First, you choose something—clothes, tickets, a mobile phone, even a new computer—and pay for it. Then you receive it a few days later by post.Online shopping has several advantages. First, you can shop at any time. The shops are always open. Second, shopping usually takes a lot of time. But to shop on the Internet you only need a computer and a mouse! You can also compare the prices of the same product and spend a lot… or save money.But many people like going out and shopping with friends. They don’t like shopping on the Internet because they can’t see the product or try the clothes on. Also paying over the Internet isn’t always safe.Online shopping is changing our way of life. One day no one will go to the shops any more, because you’ll be able to buy anything on the Internet, and you will be able to receive it anywhere in the world at any time!26.According to the passage, you pay for online shopping _________ you receive it. A.before B.afterC.when D.as27.ich is not the advantage of online shopping?A.Save money.B.Easy and quick.C.Paying over the Internet isn’t always safe.D.You can compare the prices of the same product.28.Do all the people like shopping on the Internet?A.Yes, they don’t B.Yes, they do.C.No, they don’t.D.No, they do.29.How is online shopping changing our lives?A.We don’t need to go to the shops to buy things.B.We can shop at any time.C.We can compare the prices of the same product and spend a lot… or save money. D.Above all.30.What does this passage talk about?A.ShoppingB.The advantages of online shoppingC.The disadvantages of online shoppingD.Online shoppingBYou may know a lot about smartphones. But what about smart cities?Imagine living your life like this: When you wake up in the morning, you say "Open the window" to the computer and it opens the window. The sunshine is shining and the birds are singing. Then you finish breakfast and sit in front of your desk and begin to have classes through the Internet. With the help of building a smart city, this may become true one day.A smart city uses digital technologies(数字科技)such as the Internet to improve city planning, save resources(资源) and make our lives easier. For example, people live in smart cities, where there is Internet almost everywhere. They can do many things at home, such as booking train tickets, paying water bills and shopping online. What a convenient life it is!Now China is making some cities smarter. For example, Guiyang is going to build free Wi-Fi in the whole city. Tianjin plans to start a smart city program to solve traffic problems. Guangzhou is creating a smart city, so everyone in the city should play a role in creating asmart city.31.Which city is planning to start a smart city program to solve traffic problems? A.Guiyang B.Tianjin C.Guangzhou D.Beijing 32.According to the passage, we can do the following things with Internet at home EXCEPT __________.A.booking train tickets B.having classesC.paying water bills D.having breakfast33.The underlined word "convenient" in the passage means " _____". A.difficult B.easy C.lazy D.busy 34.What will the life be like in the future?A.People in Guiyang can pay money for Wi-Fi in the whole city.B.A smart city with digital technologies will use more resources.C.People can open the windows through the computer.D.Computers can make the sun shine and birds sing.35.The passage mainly tells us ____________.A.the smart cities B.the future life C.digital technologies D.the smartphones四、补全对话7选5(本大题共5小题,每小题2分,共10分)A: Hello, Judy.B: Hi. SteveA: Are you free this Sunday?B: ___36___ I just do some washing. What about you?A: I hear there are some new animals in Wuquan Zoo. Do you want to go with me? B: ___37___.When shall we meet?A: ___38___B: Where shall we meet then?A: At the gate of Wuquan Park.B: ____39____A: It's not far from your home. You can take No 8 bus.B: OK. See you tomorrow.A: ___40___A.Let’s make it at 8:00 in the morning.B.I often watch English movies.C.How can I get there?D.I will call you tomorrow morning.E.See you then.F.Not much.G.Sounds interesting.第二部分课本知识应用五.根据句意及汉语或首字母提示写单词(本大题共10小题,每小题1分,共10分) 41.I want to be a popular singer like Zhang Jie in the f________.42.Our national flag r________ every morning.43.The teacher won't write on a blackboard with c________ in 2100.44.M________ will do the dull jobs in factories, offices and on farms.45.The box is very heavy. I can't c________ it.46.—Is this Mary's ________ (紫色的) dress?—Yes, it is.47.—Are those ________ (录音带) yours?—Yes, they are.48.There is something ________ (奇怪的) in the sky.49.This ________ (照相机) is now on sale for only 19 dollars.50.________ (千) of people come to visit Mount Tai every day.六.用所给单词的正确形式填空(本大题共10小题,每小题1分,共10分) 51.We have lunch after________ (visit) the Palace Museum.52.The factory is far, and the best way ________ (go) to work is by bike.53.Lucy and Lily are good at________ (paint) in art class.54.As soon as we finish________ (do) our homework, we'll play football. 55.There are a lot of ________ (church) in these American villages.56.This way gives us several _____(advantage).57.He spends all his time _____(play) computer games.58._____(walk) in the morning is good for our health.59.It took Sam three hours ____(get) there.60.There are many good new ways of ____(learn) a foreign language.七、阅读回答问题(本大题共5小题,每小题2分,共10分)Road accidents keep happening in every city,on every road and at any time. Traffic rules are made to keep order on the road. They can also help to keep the pedestrians(行人)safe.The pedestrian has as many rules to follow as the driver of a car. You should walk on the sidewalk or at the edge of the road. Always look carefully before you walk across the street. If you ride a bike,don't ride in the middle of the road or look around to talk. If you drive,you should slow down at the traffic lights. You must always wear a seat belt(安全带). Without the belts,both the driver and the passengers may be badly hurt in a sudden accident.Traffic rules are also called Road Safety rules. The maxim(格言)for all road usersis“Thinking about others. ”61.Why do people make traffic rules?____________________________________________________________________ 62.Does a pedestrian have many rules to follow?____________________________________________________________________63.If you ride a bike on the road, what should you not do according to the passage?____________________________________________________________________ 64.What will happen if you don't wear a seat belt when you drive?____________________________________________________________________ 65.What's the real meaning of the maxim “Thinking about others”?____________________________________________________________________八、作文(共15分)66.实行“双减”政策以来,同学们的作业减少,睡眠充足,生活更加丰富多彩。
牛津译林英语七年级下册 期中复习 Unit1-4 错题精选(二)
7B期中复习U1-4 错题精选(二)一、词汇运用1.The ____________(海滩)on Bali, the island of God, are really beautiful.2.You can think about ____________(分享)a bedroom with me if you have nowhere to stay.3.Do you know the capitals of all these _____________(country)?4.____________(luck) ! He fell off his bike and broke his left leg.5.Are these silk scarves those American ____________(visit)?6.The man from he ______________(社区)centre is friendly to us.7.The wonderful pictures are these French ____________(艺术家).8.Can you tell me one of the _________(cook) name?9.The people here are ____________(friend) .10.Don’t just keep your brother ____________(跟随)you. You should teach him how to make it ________(he).11.We have _________(足够)of time to walk there. Don’t worry.12.Why is the little girl laughing so ____________(happy)? Did anything funny happen?13.Are you busy ____________(准备)for your son’s birthday party?14.It’s my grandpa’s ___________(九十)birthday next Sunday.15.We all want to know different lifestyles in different ____________(国家).16.It’ his aunt’s ____________(四十)birthday tomorrow.17.The girls can look after ____________(they). So don’t worry.1-5 beaches sharing countries’ Unluckily visitors’6-10 community artists’ cooks’ friendly following himself11-15 enough happy preparing ninetieth countries16-17 fortieth themselves二、单项选择()1. --Would you like some more bread? --I’m full. _________.A.Give me some, please.B.Yes, please.C.Thanks all the same.D.Don’t trouble me.()2. Which floor does he live _________ that flat?A.inB.onC.in onD.on in()3. Usually, the driver’s seat is _________ the bus.A.in front ofB.in the front ofC.at the back ofD.behind()4. The price of the music sounds ________. It sounds ________ Mozart’s.A.great; asB.greatly; asC.great; likeD.greatly; like()5. There is a hotel for us to live ________ tonight, but I don’t think ________ a good place.A./; itsB.in; itsC./; it’sD.in; it’s()6. --I will ________ Wuxi tomorrow. Look after yourself well when I’m away.--I will. Give me a call when you ________ Bangkok.A.leave for; get toB.leave; getC.leave; get toD.leave for; get()7. The teachers in our school each __________ a computer now.A.are havingB.haveC.is havingD.has()8. What type of house would you like ________________?A.living inB.livingC.to live inD.to live()9. --________ do you need? --I need ________ bread.A.What else; one moreB.What other; some moreC.What else; some moreD.What other; one more()10. What ________ subjects do you want to learn?A.othersB.elseC.otherD.the other()11. Mr Smith usually goes to work ________ his car. But sometimes he takes a bus.A.inB.byC.takesD.on()12. --Which book would you like to lend me? --You can choose _______ book you like.A.anyB.someC.manyD.much()13. --Is this pencil case yours? --No, it’s not mine. It must be ________________.A.somebody elseB.somebody’s elseC.somebody else’sD.else somebody’s()14. Mr Green has three children. One is a teacher, and ____________ are doctors.A.other onesB.othersC.the otherD.the others()15. I often hear the girl ____________ the piano in the next room.A.playB.playsC.playingD.to play()16. --What a meal! It’s so kind of you to invite us. --________. I’m glad you liked it.A.Sounds goodB.Well saidC.Never mindD.Really?()17. It is known to us all that China is ____________ Japan.A.in the east ofB.west ofC.east ofD.in the west of()18. --________ was the trip to Europe in the summer holiday?--Not bad.A.WhichB.WhereC.WhatD.How()19. What ______ lovely weather! And what ________ good time we are having!A.a; aB.a; /C./; aD./; /()20. China is ________ east of Asia(亚洲)and ________ north of Australia.A.in; toB.in the; /C./; to theD.to the; /()21. Excuse me, but I would like to know ________________.A.what can I get a bookB.where the bank isC.why is the bank hereD.where to go to the bank()22. --Candy, remember ____________ the door when you go out. --OK, ________.A.closing; I won’tB.to close; I won’tC.closing; I willD.to close; I will()23. --How much ________ the Walkman ________?--It’s not very expensive. It’s about 300 yuan.A.does; costB.do; costC.does; spendD.do; spend ()24. --When will Daniel ________ here? Do you know, Paul?--Sorry, but I know he goes to the hospital to see his ________ grandmother.e; sickB.get to; ille to; illD.get; sick()25. --Would you like me to show you the way? --_______________.A.No wayB.Yes, never mindC.It’s all rightD.It’s very kind of you ()26. I’d like to take ______ trip to ______ USA. Please give ______ one-way ticket to me.A.a; /; aB.a; the; anC.the; the; aD.a; the; a()27. --Excuse me, I want to go to the museum. Which bus shall I _________?--I think the No.10 bus will ______ you there.A.get; takeB.take; takeC.take; bringD.get; bring()28. I found ______ hard to remember everything because the story was too long.A.thatB.it’sC.itD.this()29. --Where ______ the cake I bought yesterday?--I _________ it. Can you buy one more?A.is; eatB.was; ateC.is; ateD.was; eat1-5 CDBCD 6-10 DBCCC 11-15 AACDA 16-20 DBDCB21-25 BDADD 26-29 DBCC三、句型转换1.There are six chairs in the sitting room. There are two chairs in the bedroom.(同义句转换)There ________ _________ chairs in the sitting room _________ in the bedroom.2.Madee does her homework for over one hour and a half every day.(同义句转换)_________ _________ Madee over one hour and a half ______ ______ her homework every day.3.Would you like to go to the park with us?(同义句转换)_________ _________ going to the park with us?4.It is thirty minutes by bus to the centre.(对划线部分提问)_________ _________ is it to the centre?5.Is Miss Wang their English teacher?(同义句转换)_________ Miss Wang __________ ____________ ____________?6.The man wears a white shirt. The man is my uncle.(同义句转换)The man ____________ a white shirt ____________ my uncle.7.It’s only 15 minutes from my home to school by bike.(同义句转换)It ____________ only 15 minutes ________ ____________ ________ school from my home.8.We won’t have a sports meeting in our school next week.(同义句转换)There ________ ____________ ________ ________ a sports meeting in our school next week.9.I am going there by bike because I want to see the beautiful views on the way.(同义句转换)I don’t want to __________ the beautiful views on the way, ________ I’ll __________ __________ bike there.10.Did you each have a really good time, girls?(同义句转换)Did __________ __________ you really __________ __________, girls?11.I want to go to the cinema at Wanda Shopping Mall.(对划线部分提问)__________ __________ do __________ __________ to __________ __________?12.Walk along the street to the traffic lights.(同义句转换)Walk __________ the street until you __________ __________ the traffic lights. 13.If you don’t start early, you will get to school late.(同义句转换)__________ __________, or __________ _________ _________ __________ school.14.I hope I can enjoy myself at the party.(同义句转换)I hope ________ __________ ________ __________ time at the party.15.The man found nobody else in the dark room.(同义句转换)The man found __________ __________ __________ in the dark room.are eight andIt takes to doWhat aboutHow farDoes teach them Englishin istakes to ride toisn’t going to bemiss so ride aeach of have funWhich cinema you want go todown get toStart early you’ll be late forto have a goodno other people四、动词填空1.I hope your little brother ____________(get) better soon.2.Two million dollars ____________(not be) a small number for Tom’s family.3.____________(share) something with others always makes me happy.4.He together with his twin brothers ____________(sit) on the sofa now, watching TV.5.How long ________ it ____________(take) you to go from your home to school if the underground is in use?6.Look up! A group of birds ____________(fly) to the west.7.This is a very good book for young people ____________(read) in their free time.8.--Bob, would you like to go shopping with me this afternoon?--Yes, I’d love to. Where ________ we ____________(meet)?9.Lucy is a good student. She spends as much time as she can ___________(read) books.10.________ we ___________(climb) the hill tomorrow?11.__________(get) to the Sunshine Park, you need to turn left at the second turning.12.As we all know, Heilongjiang Province ___________(lie) to the north of Beijing.13.Will you please ____________(not open) the windows? It’s too cold.14.It ___________(rain) hard outside, so we have to wait.15.The police ________(be) still in search of the missing boy now.16.The fish __________(get) sick if the water is not clean enough.17.It was a pity that you failed ____________(pass) your final exam.18.If Anna ___________(not be) careful, she may get lost in the city.19.He took off his clothes and ________(lie) down to sleep.20.Mary saw the strange man get into the car and ____________(drive) away.21.Every one of us ________(get) there early because we wanted t see the animal earlier.五、完成句子1.我希望总有一天能去俄罗斯旅行。
期中必刷真题02(填空易错60道提升练,七下浙教)七年级数学下册尖子生培优必刷题(原卷版)【浙教版】
【拔尖特训】2022-2023学年七年级数学下册尖子生培优必刷题【浙教版】期中必刷真题02(填空易错60道提升练,七下浙教)一.填空题(共60小题)1.(2022春•南湖区校级期中)已知是二元一次方程ax+by﹣3=0的一个解,则1﹣6a+9b=.2.(2022秋•金东区期中)在方程y+2x=7中,用y来表示x,则x=.3.(2022春•西湖区校级期中)若关于x,y的方程组的解是,则4a2﹣9b2为.4.(2022春•镇海区校级期中)关于x、y的方程组与有相同的解,则a+b =.5.(2022春•上城区校级期中)已知关于x,y的方程组的解满足2x+y=5,则a的值为.6.(2022春•温州期中)若是方程组的解,则2a﹣2b的值是.7.(2022春•鄞州区期中)若关于x,y的方程组的解互为相反数,则a=.8.(2019春•西湖区校级期中)若关于x,y的二元一次方程的解也是二元一次方程x+y=4的解,则k的值为.9.(2022春•仙居县期中)已知关于x,y的方程组,下面结论正确的是.(写出所有正确结论的序号)①当a=1时,是该方程组的解;②当a=﹣1时,该方程组的解也是方程2x﹣y=9a的解;③无论a取何值,x,y的值始终互为相反数;④当a取某一数值时,x,y的值可能互为倒数.10.(2022春•江干区校级期中)已知关于x、y的二元一次方程组,给出下列结论中正确的是.①当这个方程组的解x、y的值互为相反数时,a=﹣2;②当a=1时,方程组的解也是方程x+y=4+2a的解;③无论a取什么实数,x+2y的值始终不变;④若用x表示y,则y=+.11.(2022春•拱墅区校级期中)已知的解是,则方程组的解是.12.(2008春•苍南县期中)解方程组时,甲同学正确解得,乙同学因把c写错而得到,则a=,b=,c=.13.(2021春•浦江县校级期中)已知关于x,y的二元一次方程组,①当方程组的解是时,m,n的值满足m﹣n=﹣1;②当m=﹣3时,无论n取何值,x﹣y的值始终不变;③当方程组的解是时,方程组的解为;④当m=1时,满足x,y都是非负整数的解最多有2组.以上说法,正确的是(填写序号).14.(2021春•衢州期中)若方程组有正整数解,则k的正整数值是.15.(2022春•余杭区期中)一个两位数,十位上的数字与个位上的数字之和为7,若把十位上的数字和个位上的数字交换位置,所得的数比原数大9,则原来的两位数是.16.(2022春•温州期中)为了表彰优秀学生,学校购买了一些钢笔和笔记本作为奖品.已知购买3支钢笔和2本笔记本共需91元,购买5支钢笔和3本笔记本共需149元,则购买1支钢笔和1本笔记本共需元.17.(2022春•宁波期中)现有糖果共计7千克.已知甲种糖果a千克,售价每千克15元,乙种糖果b千克,售价每千克20元,若共售出120元糖果.请列出方程组:.18.(2022春•龙湾区期中)如图,把7个相同的小长方形放入大长方形中,则阴影部分的面积是.19.(2021春•嵊州市校级期中)如图,在长方形ABCD中,放入6个形状、大小相同的小长方形,所标尺寸如图所示,则图中阴影部分面积为.20.(2022春•长兴县期中)如图所示是由截面为同一种矩形的墙砖粘贴的部分墙面,其中三块横放的墙砖比两块竖放的墙砖低30cm,两块竖放的墙砖比两块横放的墙砖高50cm,则每块墙砖的截面面积是cm2.21.(2022春•吴兴区校级期中)已知实数a,b满足a+b=2,a﹣b=1,则(a+b)3•(b﹣a)3的值是.22.(2022春•温州期中)=.23.(2022春•江干区校级期中)如果10x=3,10y=2,那么10x+y=.24.(2022春•衢州期中)我们知道,同底数幂的乘法法则为:a m•a n=a m+n(其中a≠0,m,n为正整数),类似地我们规定关于任意正整数m,n的一种新运算:h(m+n)=h(m)•h(n),请根据这种新运算填空:(1)若h(1)=,则h(2)=;(2)若h(1)=k(k≠0),那么h(n)•h(2022)=(用含n和k的代数式表示,其中n为正整数).25.(2022春•嘉兴期中)若3n+3n+3n=35,则n=.26.(2022春•上城区校级期中)已知x=3m+2,y=9m+3m+1,则用含x的代数式表示y为.27.(2022春•西湖区校级期中)一个多项式M与xy的积为﹣2x3y4z+xy,则M=.28.(2022春•宁波期中)若(3+x)(2x2+mx+5)的计算结果中x2项的系数为﹣3,则m=.29.(2022春•嵊州市期中)已知m+n=2,mn=﹣4,则(1﹣m)(1﹣n)=.30.(2022春•慈溪市期中)小宁同学用x张边长为a的正方形纸片,y张边长为b的正方形纸片,z张邻边长分别为a、b的长方形纸片,拼出了邻边长分别为9a+b、6a+3b的大长方形,那么小宁原来共有纸片张.31.(2022春•长兴县期中)已知6x=192,32y=192,则(﹣6)(x﹣1)(y﹣1)+2的值为.32.(2021春•拱墅区校级期中)若25x2+1加上一个单项式能成为一个完全平方式,这个单项式是.33.(2022春•南湖区校级期中)设(a﹣2b)2+A=a(a+2b),则A=.34.(2022春•温州期中)如图,在大长方形ABCD中放入5张相同的小长方形(图中空白部分).若大长方形的周长是48,图中阴影部分的面积是78,则一张小长方形的面积.35.(2022春•鹿城区校级期中)如果a﹣b=4,ab=1,则(2a+2b+1)(2a+2b﹣1)=.36.(2022春•下城区期中)如图,在边长为a(cm)的大正方形内放入三个边长都为b(cm)(a>b)的小正方形纸片,这三张纸片没有盖住的面积是4cm2,则a2﹣2ab+b2的值为.37.(2021春•拱墅区校级期中)若代数式ab(5ka﹣3b)﹣(ka﹣b)(3ab﹣4a2)的值与b的取值无关,则常数k的值.38.(2021春•拱墅区期中)已知x2n=2,则(x3n)2﹣(x2)2n的值为.39.(2021春•余姚市校级期中)已知a2+a﹣3=0,那么a2(a+4)的值是.40.(2022春•嵊州市期中)已知2a=3,8b=6,22a﹣3b的值为.41.(2022春•温州期中)如图,将△ABC沿BC方向平移6cm得到△DEF,若BF=5CE,则BC的长为.42.(2022春•绍兴期中)将一条两边互相平行的纸带如图所示折叠,已知∠DAB=69°,求∠FBC=.43.(2022春•海曙区校级期中)如图,AB∥EG,CD∥EF,BC∥DE,若x=50°,y=30°,则z度数为.44.(2022春•温州期中)如图,已知直线MN∥PQ,把直角三角板放置在两条平行线间,点A在MN上,点B在PQ上.若∠NAC=74°,则∠QBC=°.45.(2022春•上城区校级期中)如图,已知线段AB∥直线CD,延长AB至E,O点为直线CD上的一动点,连结BO,过点O作FG⊥BO交BF于F点,交BG于G点,BF、BG分别为∠ABO和∠EBO的平分线,在点O整个运动过程中,当∠BFG=2∠BGF时,则∠COF=.46.(2022春•兰溪市期中)如图,直线l1∥l2,若∠1=40°,∠2比∠3大10°,则∠4=.47.(2022春•西湖区校级期中)如图,点F是长方形ABCD的边BC上一点,将长方形的一角沿AF折叠,点B的折叠点E落在长方形ABCD外侧,若AE∥BD,∠ADB=28°,则∠EAD=°,∠AFC=°.48.(2022春•上城区校级期中)如图a∥b,c与a相交,d与b相交,下列说法:①若∠1=∠2,则∠3=∠4;②若∠1+∠4=180°,则c∥d;③∠4﹣∠2=∠3﹣∠1;④∠1+∠2+∠3+∠4=360°.正确的有(填序号).49.(2022春•杭州期中)如图,在△ABC中,∠ABC+∠ACB=α,按图进行翻折,使MD∥NG∥BC,ME ∥FG,则∠NFE的度数是.50.(2022春•镇海区校级期中)如图所示,点D,E分别在BA,BC上,∠ADF=α度,∠CEG=β度,∠ABC=γ度,DF∥EG,则写出α,β,γ的数量关系.51.(2022春•龙湾区期中)在数学拓展课《折叠的奥秘》中,老师提出一个问题:如图,有一条长方形纸带ABCD,点E在AD上,点F在BC上,把长方形纸带沿EF折叠,若∠B'FB=80°,则∠AEF=°.52.(2022春•诸暨市期中)如图所示,已知射线CB∥OA,∠C=∠OAB=120°,E、F在CB上,且满足∠FOB=∠AOB,OE平分∠COF.(1)则∠EOB的度数为;(2)在平行移动AB的过程中,当∠OEC=∠OBA时,∠OEC=度.53.(2022春•义乌市期中)如图,AB∥CD,AD∥BC,点E、F分别是线段BC和CD上的动点,在两点运动到某一位置时,恰好使得∠AEF=∠AFE,此时量得∠BAE=15°,∠FEC=12°,∠DAF=25°,则∠EFC=.54.(2021秋•平阳县期中)如图1是一个消防云梯,其示意图如图2所示,此消防云梯由救援台AB,延展臂BC(B在C的左侧),伸展主臂CD,支撑臂EF构成,在操作过程中,救援台AB,车身GH及地面MN三者始终保持平行.当∠EFH=65°,BC∥EF时,∠ABC=度;如图3,为了参与另外一项高空救援工作,需要进行调整,使得延展臂BC与支撑臂EF所在直线互相垂直,且∠EFH=68°,则这时∠ABC=度.55.(2022春•孝南区期中)如图是一块长方形ABCD的场地,长AB=a米,宽AD=b米,从A、B两处入口的小路宽都为1米,两小路汇合处路宽为2米,其余部分种植草坪,则草坪面积为米2.56.(2021春•拱墅区期中)如图,将一条对边互相平行的长方形纸带进行两次折叠,折痕分别为AB、CD.若CD∥BE,且∠1=46°,则∠2=.57.(2022春•萧山区期中)如图,已知AB∥CD,点E,F分别在直线AB,CD上,点P在AB,CD之间且在EF的左侧.若将射线EA沿EP折叠,射线FC沿FP折叠,折叠后的两条射线互相垂直,则∠EPF 的度数为.58.(2022春•鄞州区校级期中)如图,已知GF⊥AB,∠1=∠2,∠B=∠AGH,则下列结论:①GH∥BC;②∠D=∠F;③HE平分∠AHG;④HE⊥AB,其中正确的是(只填序号)59.(2022春•洪山区期中)若∠A与∠B的两边分别平行,且∠A比∠B的3倍少40°,则∠B=度.60.(2021春•婺城区校级期中)如图1,赤道式日晷是中国古代最经典和传统的计时仪器,由底座、晷面、晷针三部分组成,其中底座面与日晷所处地地球半径垂直.(1)晷针与晷面夹角为;(2)如图2,日晷所处纬度α为50°,若太阳光(平行光)与日晷底座面夹角为60°,则太阳光与该晷面所夹锐角角度为.。
牛津译林版七年级下册英语期中复习易错题整理(word版含答案)
2019 — 2020学年第二学期牛津译林版七年级下册英语期中复习易错题整理一、单项选择:(本大题共40 小题,每小题 1 分,共 40分)1.When she walks the shop, she often stops a look.A. pass; to haveB. pass; havingC. past; havingD. past; to have2.Benny is ________11 -year-old boy. ________ boy comes from America.A. a; /B. a; TheC. an; TheD. an; An3.Each of the singers ______ a ______ swimming pool.A. has; fifty -metre-longB. have; fifty -metres-longC. has; fifty -metres-longD. have; fifty -metre-long4.If it ________ next Sunday, _______you still _________the Great Wall?A. will rain; do; visitB. will rain; will; visitC. rains; do; visitD. rains; will; visit5.--- ______ a baby panda ________, do you know?---It is quite small and has little fur.A.What ’ s; likeB. What does; likeC. How does; look likeD. How is; like6.--- I ’ m sorry I ______ my exercise book at home.--- Don’ t forget _______ it to school tomorrow, please.A. forgot, to takeB. left, to bringC. forgot, to bringD. left, to take7.There are _______ visitors to the wetland park, and the number is becoming _______ now.A. thousand of; larger and largerB. thousands of; more and moreC. thousands of; larger and largerD. thousand of; more and more8.--- Would you like to live in a big house with a garden and five bedrooms?--- I ’ d like to, __________I’(m富not有的rich) enough.A. andB. soC. asD. but9.Bears move around slowly in the daytime, which makes them look ________ lazy.A. a fewB. a littleC. fewD. little10.--- Will it be sunny tomorrow morning?--- It ________ fine. Who knows? The weather always changes quickly in this season.A. must beB. will beC. may beD. maybe11.--- What’ s the young man over there?--- He is _______ engineer. He has _______ one-year-old son.A. an; aB. an; theC. an; anD. a; a12.It ’ s really ______ to leave a-month12-old baby at home alone.A. dangerousB. helpfulC. differentD. funny13.--- I hear that there _______ another Wanda Plaza near our town next year.--- That ’ s great! Let’ s go shopping there when it opens.A. isB. will haveC. is going to haveD. is going to be14.Look! It is ______ so _______!A. snows; heavilyB. snowing; heavilyC. snowing; heavyD. snowing; big15.Boys, I’ ll tell you __________, and you can do it ____________.A. how to do; by yourselfB. what to do; by yourselfC. how to do; aloneD. what to do; on your own16.--- __________ is it from Sunshine Town to the center of Beijing?--- It ’ s about 20 kilometers ________ our school.A .How often, far from B. How long, away fromC. How soon, far away fromD. How far, away from17.---What kind of house do you _____?---A flat _____ three bedrooms.A. live; hasB. live; withC. live in; hasD. live in; with18.---Look at the shoes, Daniel. They look like yours.---No. Mine ________ black and white.A. isB. haveC. areD. has19. I want to invite you and your father to my dinner party.A. will comeB. comeC. to comeD. comes20.The music sounds _______ and it bring us _________.A. sweet, happinessB. sweet, happyC. sweetly, happilyD. sweetly, happy21.I asked my father to play _______ baseball with me______ such a sunny morning.A. /, inB. /, onC. the, inD. the, on22._________ ten years old, Lin Tao took a train to Shanghai ________ the first time.A.In, atB. Of, atC. At, forD. At, of23.The mother was worried the baby kept ______________.A. because, cryingB. because of, to cryC. because of, cryingD. because, cried24.There is a(n) ______ boy in hospital. The doctor will make him ___________ better.A. ill; feelsB. sick; feelsC. ill; feelD. sick; feel25.This is ________ bedroom. Jenny shares it ________ her twin sister.A. Jenny and Maria’ s; ofB. Jenny and Maria’ s; withC. Jenny’ s and Maria’ s; aboutD. Jenny ’ s and Maria; with26.--- Will there ________ a football match on CCTV 5 this evening?---Yes. There ________ usually football matches on Sunday evenings.A. have; haveB. be; will beC. are; areD. be; are27.--- Don’ t be late again tomorrow.---__________________.A. Thanks.B. You’ re welcome.C. Sorry, I won’ t.D.OK, I will28.--- Dad, must we cross the road at the zebra crossing?--- Yes, I ’ m afraid we _______. We have to follow the traffic rule.A. canB. mayC. mustD. need29._______ fast the 5G phones are! It is said we can download a 1GB film in 3 seconds.A. HowB. WhatC. What aD. How a30.--- Tom, what ’ s in your ________hand?---Oh, just an eraser.A. anotherB. the otherC. otherD. others31.May likes looking out ________ the garden __________ the bedroom.A. at; ofB. of; atC. of; fromD. at; from32.--- I hope you and your family _________ your holiday here.--- Thank you so much. I’ m sure we ’ ll have a good time here.A.to enjoyB. enjoyedC. will enjoyD. enjoying33.I found ________ not easy to do difficult work alone in the beginning.A. thatB. itC. itsD. it ’s34.Sandy ’ s parents, __________my father, __________ jogging in the park in the morning.A. like; likesB. likes; likeC. likes; likesD. like; like35.--- Is the girl looking forward __________ the famous singer?---Yes, it’ s her dream.A. meetB. meetingC. to meetD. to meeting36.There are over two __________ office workers in the company, but __________ of young people hope towork in it.A. hundred; hundredsB. hundreds; hundredsC. hundred; hundredD. hundreds; hundred37.The United States is __________ the south of Canada and __________ the east of Japan.A. to; inB. on; toC. in; besideD. at; on38.---will you finish reading these books?--- In about two weeks.A. How longB. How oftenC. How soonD. How far39.We can make a fire the room warm.A. to keepB. keepingC. keepD. keeps40.Would you like me this evening,Meimei?A.help;to wash clothes B .help ;cook supperC. to help;with the supperD.to help ;doing some washing二、句型转换:(本大题共 6 小题,每空0.5 分,共 10 分)1. These are Millie’ s key对划rings线部.(分提问)________ ________ ________ ________ ________?2.Anna and her sister live in the same bedroom.( 改为同义句 )Anna ________ the bedroom________ her sister.3.Red Square in Moscow is about 91,000 square meters in area.( 改为同义句 )Red Square in Moscow ________ ________ ________ ________ about 91,000 square meters.4. There's something wrong with Amy’ s改bicycle为同义.(句)Amy’ s bicycle isn’ t ________ ________.5.To get to the post office, please take the second turning on the left.( 改为同义句 )To get to the post office, please________ _________ ________ the second turning.6.The primary school is east of the Children改为’同s义Hospital句).(The Children’ s Hospital is________ ________ ________ ________ the primary school.三、动词填空:(本大题共10 小题,每小题 1 分,共 10 分)1.Miss Li told us _____________ (not give) any food to the animals in the zoo.2.Mr Zhang _____________ (bring) us a lot of fun when he was our Maths teacher.3.He spends as much time as he can __________ (chat) with his friends online.4.-- Would you like to go and have a cup of coffee with me? -- I ’ d love to, but I ____________ (wait) for my sister.5.Why not ____________ (stop) readi ng books on the phone? It’ s bad for your eyes.6.I hope my family ____________(visit) the Great Wall next month.7. The next Saturday, he _____________ (plan) to go for a picnic, didn’ t he?8.It ’ s so cloudy. I think it ____________ (rain).9.The baby is very lovely. She always makes us ____________ (laugh) happily.10.The students _____________ (prepare) for the Reading Festival these days.四、拓展阅读:(本大题共 5 小题,每小题 2 分,共10 分)Rick goes to Boston for a meeting. The meeting is in Prince’ s Building on 44th Street, and Rick be there on time. However, it is Rick’ s first time to visit the city, so he doesn’ t know the couple ( 夫妇 ) sitting on a bench ( 长凳 ), he asks them for help. The couple tell Rick to take the underground andget off at Prince Station. Rick follows their advice, gets off at Prince Station and walks east. An hour later, he is disappointed to find that he is on 41st Street, not 44th Street. The couple misheard (听错 ) him and told him thewrong way.Another hour later, when a policeman takes him back, he sees the couple again. They are still sitting onthe bench, right in front of Prince’ s Building.()1. Why does Rick go to Boston?A. To have a party.B. To have a meeting.C. To go shopping.D. To visit his friends.()2. Which of the following is true?A. Rick lives in Boston.B. Prince ’ s Building is on 41st Street.C. Rick doesn ’ t know Boston well.D. Rick knows the couple.()3. Where is Prince Station?A. On 41st Street.B. On 44th Street.C. On 42nd Street.D. On 43rd Street.()4. The underlined word‘ disappointed means’in Chinese.A. 兴奋的B. 欣喜的C. 满意的D. 失望的()5 . How long does it take Rick to find Prince’ s Building finally?A. One hour.B. One and a half hours.C. Two hours.D. Three hours.参考答案单项选择1-15 DCADA BCDBC AADBD16-30 DDCCA BCADB DCCAC31-40 BCBAD ABCAC句型转换1.Whose key rings are these2.shares with3.has/covers an area of4.working well5.turn left at6.to the west of动词填空1. not to give2. brought3. chatting4. am waiting5. stop6. will visit7. planned8. is going to rain9. laugh10. are preparing 拓展阅读BCADC。
七年级期中错题巩固
代数式中的增加与减少7、某商场经销一批空调,进价为每台x 元,原零售价比进价高%m ,后根据市场变化,把零售价调整为原零售价的%n ,则调整后的零售价为每台( ) A .(1+-)x 元 B .(1+)x 元 C .(1+)(1-)x 元 D .(1-)x 元单项式与多项式的概念、系数与次数以及同类项的辨别12.y xy +的次数 .%m %n %m %n ⋅%m %n %m %n5.已知一个单项式的系数是2,次数是3,则这个单项式可以是A.22xy - B.23x C.32xy D.32x10.(4分)已知m 、n 为常数,代数式2x 4y +mx |5﹣n |y +xy 化简之后为单项式,则m n 的值共有( ) A .1个 B .2个 C .3个D .4个多项式的化简求值(2)先化简再求值:()()222234,1,1x y xy x y xy x y x y +---==-其中多项式的值与某个字母的取值无关或者不含几次项,求参数的取值19.已知,,12132322-+=++--=mx x B x mx x A 若2A+3B 的值与x 的值无关,则m 的值是_______.21.已知:.11232-+=--+=ab a B a ab a A , (1)求A-2B 的值;(2)当a 取任何数值,A-2B 的值是一个定值时,求b 的值.23.(本题满分8分)已知:132--=mx x A ,522--=x x B .(1)若B A 3-的值与x 的值无关,求m 的值;(2)若2m =,试比较A 与B 的大小(要求写出过程).数轴与绝对值6.如图,数轴的单位长度为1,若点A 和点C 所表示的两个数的绝对值相等,则点B 表示的数是A.-3B.-1C.1D.3升幂与降幂12、多项式 23213ab a b a ---按字母 a 的升幂排列是 。
18.把代数式2x 2﹣8xy 3+x 4y ﹣y 2+9x 3y 4按下列要求填空: (1)按字母x 的升幂排列 (2)按字母y 的降幂排列 .14.把多项式23142x x x -+-按x 的降幂排列为 .整式的应用阴影部分面积与组合图形边长、周长、面积的计算27.(本题满分8分)如图所示,用三种大小不等的正方形①②③和一个缺角的正方形拼成一个长方形ABCD (不重叠且没有缝隙),若GH=a ,GK=a +1,BF=a -2. (1)试用含a 的代数式表示:正方形②的边长CM 的长= ;正方形③的边长DM 的长= ;(2)求长方形ABCD 的周长(用含a 的代数式表示);并求出当a=3时,长方形周长的值.定义新运算20(6分)已知b a 、均为有理数,现定义一种新的运算,规定:25a b a ab ⊗=+-,例如2111125⊗=+⨯-求(1)()-36⊗的值 (2)()32---592⎡⎤⎛⎫⊗⊗⎡⎤ ⎪⎢⎥⎣⎦⎝⎭⎣⎦的值①② ③。
7下数学期中考试易错题
七下期中考试易错题一、填空题
17.下列说法中错误
..的是…………………………………………………( )
A、无限循环小数都是有理数。
B、
3
是分数。
C、无理数是无限小数。
D、实数包括有理数和无理数。
18.下列说法正确的是…………………………………………………………
()
A、相等的角是对顶角。
B、两条直线被第三条直线所截,同位角相等。
C、相邻的角互补。
D、两直线垂直,它们的夹角是90°。
19.如果两个角的两边分别平行,那么这两个角的数量关系是………………
()
A、相等
B、互补
C、相等或互补
D、不确定
20.如图,一条公路修到湖边时,需拐弯绕湖而过,如果第一次拐角∠ A 是120°,第二次拐角∠B是150°,第三次拐角是∠C,这时的道路
恰好和第一次拐弯之前的道路平行,
则∠C是…………………()A、150°B、140°
C、130°
D、120°A
B C
第6题
三、简答题
四、解答题
五、综合题。
2020-2021学年江苏译林牛津英语七年级下期中复习Unit3错题整理(含答案)
译林牛津英语7年级下期中复习U3错题整理一、单项填空1.The cheese cake so good that I can't wait to eat it.A. tastesB. feelsC. soundsD. smells2. This street is for its local snacks(小吃). Come here and enjoy them!A. freshB. famousC. quietD. friendly3. —Doctor, what's wrong with me?—serious. You have just got a cold.A. SomethingB. NothingC. EverythingD. Anything4. Father goes to the gym with me although he dislikes going there.A. neverB. hardlyC. seldomD. sometimes5.—is it from here to the History Museum? —About 20 minutes by taxi.A. How longB. How farC. How soonD. How often6.--I sick in the stomach. I may have eaten the wrong thing. --You'd better go to see a doctor.A. feelB. lookC. soundD. taste7. I can't find shoe. Where is it?A. otherB. anotherC. the otherD. the others8.---Is ________ ready for the trip?---No. we still need to buy a map before we start the trip.A.anythingB. somethingC. everythingD. nothing9. ---Will you come to join us in the trip? --- . You see, I have to get ready for my coming party. Thank you B. I'd love to C. I am afraid not D. All right10. —Ann, where are Lucy and Lily?—Look back. They are just 50 metres ______ us.A. underB. insideC. behindD. above11. —There is a monkey ______ the tree. What's he doing?—He is eating the fruit ______ the tree.A. on; onB. in; onC. on; inD. in; in12. —______ is it from the railway station to the zoo?—It’s a long way. It takes about an hour by underground.A. How longB. How farC. How muchD. How soon13. The woman has two children. One is five years old and ______ is two years old.A. otherB. anotherC. othersD. the otherDBBDB ACCCC BBD二、词汇运用1.Taking the (地铁) to our town from Nanjing takes only twenty minutes.2.We often open the classroom's windows and let the (新鲜的) air in.3.There is an open-air (剧场) in my hometown at weekends.4.Hurry up! I don't want to (错过) the football game.5. I would like to live in tall _________ (build) because we can be close to our friends.6. KFC and Mc Donalds are famous ________ (west) restaurants.7.The air in this city is very________ (新鲜的). We all like living here.8.The old man ________ (饲养) 3,000 chickens on the farm last year.9. Jack got up so late that he _______________(错过)the last train.10. Your hands look so _________________(脏的). Go and wash them. Underground fresh theater miss building western fresh raised missed dirty三、动词填空。
2020年春人教版七年级下册期中复习巩固(包含答案)
七年级下册期中考试一、单项选择题1.3的相反数是()A . 3 B. 3 C.3 D.3 32.以下各图中,∠1 与∠ 2 是对顶角的是()A .B.C.D.3.如图, a∥ b,1= 2,若3=40 °,则 4 等于 ()A.40°B. 50°C.60°D. 70°4.若点 P( m+ 3, m- 2)在直角坐标系的x 轴上,则点 P 的坐标为()A.(0,5) B .(5, 0)C.(- 5, 0)D.( 0,-5)5.在同一个平面内,不重合的两条直线的地点关系是()A .平行或垂直B.订交或垂直C.平行或订交D.不可以确立6.黄金切割数5 1是一个很巧妙的数,大批应用于艺术、建筑和统计决议等方面,请你2估量5﹣1 的值()A .在 1.1 和之间B .在和之间C.在 1.3 和之间D.在 1.4 和 1.5 之间11 ? ?,010010001 (相邻两个 1 之间挨次增添 1 个 0),,7.在数 0,,, 0.137 22.3%中,无理数有()A.2 个B.3个C.4 个D.5 个8 1是同一个数的平方根,则m 的值是().若 2m 4 与 3mA.-3 B. 1 C.-3 或 1 D. -19.点 A ( 2, -2)对于 x 轴对称点的坐标为()A .( -2,2)B.( -2,-2)C.(2, 2)D.( 2, -2)10.点 A 到x轴的距离是 3,到y轴的距离是6,且点 A 在第二象限,则点 A 的坐标是()A . (-3,6) B.( -6,3)C.(3,-6) D.( 6,-3)11.已知坐标平面内,线段AB P x 轴,点A( 2,4), AB 1,则 B 点坐标为()A.1,4 B.3,4 C.1,4或3,4 D.2,3或2,5 12.如下图,若AB//CD ,则∠A ,∠E,∠D 之间的度数关系是()A.∠A + ∠ D+ ∠E=180 °B.∠A - ∠ D + ∠ E= 180 °C.∠A+ ∠D -二、填空题∠ E= 180 °D.∠A + ∠ D + ∠E = 270 °13.16 的算术平方根是_____.14.如图,已知∠ 1=75°,假如CD∥BE,那么∠B=_______.15.一个数的算术平方根为3m 4 ,平方根为2m 1 ,则这个数是 _______.16.比较大小,5 1_______ 11.(填 " "," ",或" " )2 217.已知点 P 的坐标为( 2-a,3a+6),且点 P 到两坐标轴的距离相等,则 a=_____________.18.已知点在第四象限,且点P 到x 轴的距离为,到 y 轴的距离为,那么点P的坐标为5 2_____.19.如图,对于以下条件:①∠ B+∠BCD =180°;②∠ 1=∠ 2;③∠ 3=∠ 4;④∠ D =∠5;其中必定能判断AB∥ CD 的条件有 _____(填写全部正确条件的序号).20.已知:如图, AB ∥ CD,∠ B+∠ D=180°,求证: BE ∥ FD .三、解答题21.计算:2 22 83 27;322.已知m,n分别表示5 7 的整数部分和小数部分,求3mn n2的值.23.已知点 P 的坐标为 2 a, 3a 6 .(1 )若点 P 在y轴上,求 P 点坐标.(2 )若点 P 到两坐标轴的距离相等,求点P 的坐标.24.如图,在平面直角坐标系中,点 A ( 4、0)、 B( 3, 4),C( 0,2).(1)求S四边形ABCO;(求四边形ABCO 的面积)(2)在 x 轴上能否存在一点P ,使S APB 4 ,(三角形APB的面积),若存在,请直接写出点 P 坐标.25. (1) 问题发现:如图①,直线????//????,E是AB与AD之间的一点,连结BE, CE,能够发现∠B+ ∠ C= ∠ E.请写出证明过程。
人教版七年级下期中总复习易错题过关
期中复习易错题1.下列说法不正确的是( )A .125的平方根是15±B .9−是81的一个平方根C .0.2的算术平方根是0.04D .27−的立方根是3− 2.下列命题中,真命题的个数有( )①无限小数是无理数; ②立方根等于它本身的数有两个,是0和1;③同位角相等; ④过一点有且只有一条直线与已知直线平行.A .0个B .1个C .2个D .3个3.下列命题是真命题的有( )个①两条直线被第三条直线所截,同位角的平分线平行 ②垂直于同一条直线的两条直线互相平行 ③过一点有且只有一条直线与已知直线平行 ④对顶角相等,邻补角互补A .1B .2C .3D .44.将正整数按如图所示的规律排列,若有序数对(,)n m 表示第n 排,从左到右第m个数,如(4,2)表示9,则表示123的有序数对是( )A .(16,3)B .(15,3)C .(16,14)D .(15,13)5.已知点(2,4)A ,//AB y 轴,且5AB =,则B 点坐标是( )A .(3,4)−B .(2,9)或(2,1)−C .(7,4)D .(3,4)−或(7,4)6.如图,直线//EF MN ,点A ,B 分别是EF ,MN 上的动点,点G 在MN 上,ACB m ∠=︒,AGB ∠和CBN ∠的角平分线交于点D ,若52D ∠=︒,则m 的值为( ) A .70 B .74 C .76 D .807.①点(2,3)A −到y 轴的距离是 ; 的算术平方根是 ;③的值是 .8.实数a 、b 在数轴上所对应的点如图所示,则||b a +的值 .9.实数a 、b 、c = .10==,⋯,根据你发现的规律,若式子a =、b = .11.定义:(f x ,)(y x =−,)y −,(g a ,)(b b =,)a ,例如:(1f ,2)(1=−,2)−,(2g ,3)(3=,2),则((5,2))g f −= .12.教材上曾让同学们探索过线段的中点坐标:在平面直角坐标系中,若两点1(A x ,1)y 、2(B x ,2)y ,所连线段AB 的中点是M ,则M 的坐标为12(2x x +,12)2y y +,例如:点(1,2)A 、点(3,6)B ,则线段AB 的中点M 的坐标为13(2+,26)2+,即(2,4)M 请利用以上结论解决问题:在平面直角坐标系中,若点(1,)E a a −,(,)F b a b −,线段EF 的中点G 恰好位于x 轴上,且到y 轴的距离是2,则2a b +的值等于 .13.如图,在平面直角坐标系中,点A ,B ,C 三点的坐标分别是(2,0)A −,(0,4)B ,(0,1)C −,过点C 作//CD AB ,交第一象限的角平分线于点D ,连接AD 交y 轴于点E .则点E 的坐标为 .14.如图,在三角形ABC 中,90C ∠=︒,3AC cm =,4BC cm =,将三角形ABC 沿直线CB 向右平移1cm 得到三角形DEF ,DF 交AB 于点G ,则四边形DGBE 的面积为 2cm .15.在平面坐标系内,(1,1)A −−、(2,3)B ,M 是x 轴上一点,使MB MA +的值最小,则M 的坐标为16.求下列各式中的x 值(1)216(1)49x += (2)38(1)125x −=17.计算:(1+ (2)|1+.18.已知:a 是8+的小数部分,b 是8(1)求a 、b 的值;(2)求445a b ++的平方根.19.已知在平面直角坐标系中有三点(2,1)A −、(3,1)B 、(2,3)C .请回答如下问题:(1)在坐标系内描出点A 、B 、C 的位置;(2)求出以A 、B 、C 三点为顶点的三角形的面积;(3)在y 轴上是否存在点P ,使以A 、B 、P 三点为顶点的三角形的面积为10,若存在,请直接写出点P 的坐标;若不存在,请说明理由.20.已知三角形ABC 的边AB 上任意一点0(P x ,0)y 经过平移后的对应点为10(4P x +,03)y +.(1)将三角形ABC 作同样的平移得到三角形111A B C ,在下图中画出三角形111A B C ,并直接写出1A 、1B 、1C 的坐标.(2)求出三角形ABC 扫过的面积.(重叠部分不重复计算)21.如图,在边长为1个单位长度的小正方形组成的网格中,ABC ∆的顶点均在格点上.(1)请建立合适的平面直角坐标系,使点A ,B 的坐标分别为(3,5)A −、(4,2)B ,并写出点C 的坐标;(2)在(1)的条件下,将线段AB 平移至线段CD (其中点A 的对应点为点)C ,请画出线段CD ,并写出点D 的坐标;(3)直接写出直线AB 与y 轴交点的坐标.22.某小区准备开发一块长为32m,宽为21m的长方形空地.(1)方案一:如图,将这块空地种上草坪,中间修一条弯曲的小路,小路的左边线向右平移a(0.81)m a就是它的右边线.则这块草地的面积为2m;(2)方案二:修建一个长是宽的1.6倍,面积为2432m的篮球场,若比赛用的篮球场要求长在25m到30m之间,宽在13m到20m之间.这个篮球场能用做比赛吗?并说明理由.23.如图1,已知在平面直角坐标系中,点(4,0)A−,点(0,3)B,将线段AB向右平移4个单位长度至OC的位置,连BC.(1)直接写出点C的坐标;(2)如图2,过点C作CD x⊥轴于点D,在x轴正半轴有一点(1,0)E,过点E作x轴的垂线EF交BC于F,动点P从F点开始,以每秒1个单位长度的速度沿射线FE运动,设运动的时间为t(秒),连接AC.①试问:PCD∆的面积是否为定值?若是,求出定值;若不是,请说明理由;②当PCA∆的面积为332时,求t的值及此时点P的坐标.。
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七年级下期期中错题巩固集锦
1.计算23()a 的结果是( )
A .5a
B .5a -
C .6a
D .6
a - 2.下列运算正确的是( )
A .22321a b a b -=
B .339
a a a ⋅= C .222()a
b a b +=+ D .22(3)33xy x y y ÷= 3.下列各式中,不能应用平方差公式进行计算的是( )
A .()()a b a b --+
B .()()x y x y +-
C .(2)(2)x y y x -++
D .(2)(2)m n m n -+-- 4.H7N9型禽流感是一种新型禽流感,于2013年3月在上海和安徽两地率先发现,截至2014年4月22日19时,全国H7N9禽流感患者人数增至104例,小明上网查得H7N9禽流感病毒的直径大约是0.00000008米,则它的直径用科学计数法可表示为( )米
A .0.8×10﹣7
B .8×10﹣7
C .8×10﹣8
D .8×10﹣9
5.如图,下列各组条件中,不能得到//c d 的是( )
A .23∠=∠
B .12180∠+∠=
C .24180∠+∠=
D .25∠=∠
6.已知2425x mx -+是完全平方式,则常数m 的值为( )
A .10
B .10±
C .20-
D .20±
7.2012×2016﹣20142=__________
8.一个角的补角是它的余角的3倍,则这个角的度数为________度。
9.计算2(31)(8)x x mx -++的结果中不含2x 项,则常数m 的值为_______
10.若23
3216m m +-=,则常数m 的值为_________
11.如图,AB//CD ,∠1=120°,∠2=56°,则∠3=________度。
12.己知4xy =,5x y -=,则225x xy y ++=_________.
13.已知2264130x y x y ++++=,则y x 的值为_________.
14.2
012009124(1)
2--⎛⎫-+⨯-⨯- ⎪⎝⎭ 15.32234()()3x y xy x y ⋅÷-
16.22(43)3(3)x x x ---+ 17.2(21)(21)(23)x x x +--+
18.(32)(32)a b c a b c +---
19.先化简,后求值:22(23)(2)(2)4x x y x y y --+--,其中2
410x x --=
20.如图,已知∠1+∠2=180°,∠B=∠3,求证:DE//BC。