佛山一中2020届高三10月份月考试题
佛山一中2020届高三10月份月考答案
英语学习讲义佛山一中2020届高三英语10月份月考答案第一部分:阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)1-3 CDB 4-7 DACB 8-11 AABD 12-15 DCBA第二节(共5小题;每小题2分,满分10分)16-20 EFCGB第二部分:语言知识及应用(共两节,满分45分)第一节完形填空(共20小题;每小题1.5分,满分30分)21-25 BCABD 26-30 ADABD 31-35 BACBC 36-40 DCADC第二节语法填空(共10小题;每小题1.5分,满分15分)41. greater 42.a 43. is 44.on 45. that/which 46. studies 47. regularly 48. stepping 49. to bring 50. relief第三部分:写作(共两节;满分35分)第一节短文改错(共10小题;每小题l分,满分10分)I like eating fruit and vegetables what are of great benefit to our health. Not only do theywhich/thatprevent us from falling into ill, but also they help them lose weight. I used to hate vegetables,usand following the d octor’s advice, I gradually kick the bad habit. Just as an old saying going, but kicked goes “An apple a day keeps the doctor away.” However, there are still many children dislike fruitdisliking或dislike前加who and vegetables. On∧ contrary, influenced by this or that kind of advertisement, many are thecrazy about junk food. Consequent, they become weaker and weaker instead of get strong.Consequently strongerIn my opinion, we must take action to change it.第二节书面表达(满分25分)参考范文:Dear Peter,I’m Li Hua, Chairman of the Student Union of Yucai Middle School. Thank you so much for inviting us to have a one-week communication activity at your school and I am writing to enquire about further details.I am planning to take 10 members of our Student Union to go to your school next month, hoping to make good use of this opportunity to communicate and learn from each other. So I’d like to know what the best date of our arrival is. Above all, could you possibly send me a specific daily schedule of the activity in advance so that I can prepare better for the trip? Last but not least, this being our first experience to go to America, would you be kind enough to offer some suggestions on what necessities we specially need to take with us?We are really excited and looking forward to the activity. I would appreciate it if you could give me a favorable reply at your earliest convenience.Yours sincerely,Li Hua 只要坚持梦想终会实现 1。
广东省佛山市第一中学2020届高三历史上学期10月月考试题
广东省佛山市第一中学2020届高三历史上学期10月月考试题本试题卷共8 页, 29 题。
全卷满100 分,考试用时90 分钟。
注意事项:1.本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分。
答题前,考生务必用黑色字迹的钢笔或签字笔将自己的姓名、班别、考生号、试室号、座位号填写在答卷上和答题卡上,并用2B铅笔在答题卡的相应位置填涂考生号。
2.回答第Ⅰ卷时,选出每小题答案后,用2B铅笔把答题卡上对应题目的答案标号涂黑。
如需改动,用橡皮擦干净后,再选涂其他答案标号。
写在试卷上无效。
3.回答第Ⅱ卷时,必须用黑色字迹的钢笔或签字笔作答,将答案写在答卷相应的位置上。
写在试卷上无效。
如需改动,先划掉原来的答案,然后再写上新的答案;不准使用铅笔和涂改液。
不按以上要求作答的答案无效.第Ⅰ卷本卷共26小题,每小题2分,共52分。
在每个小题给出的四个选项中,只有一项是符合题目要求的。
每题选出答案后,请用2B 铅笔将答案涂在答题卡的相应位置上。
1.周文王与正妻的儿子康叔封于殷商故都,继续采用殷商的法律,按照周的绳索长度计量土地。
周成王的同母弟唐叔封于夏朝的中心地带,沿用夏朝的政治制度进行管理。
这说明西周初年统治者A.严格实行嫡长子继承制B.对被征服地区采取安抚政策C.加强对地方的直接控制D.意图保护地方文化的独立性2。
某学者总结了汉武帝决心实行“独尊儒术”的历史背景,如下表所示。
据此可知,汉武帝实行“独尊儒术”旨在A。
践行先秦儒家追求和谐的主张B。
缓解面临的各种矛盾C。
整合诸子百家治理国家的理念D. 促成“大一统”的局面3.某学者认为“从整体上说,中国大部分时间是重农不抑商,农业固然受到重视,但商业也并没有受到抑制,私人工商业一直有充分发展的空间.”不能为这一观点提供佐证的是A. “农不出则乏其食,工不出则乏其事,商不出则三宝绝,虞不出则财匮少”B.“事末利及怠而贫者,举以为收孥”C.“贩夫贩妇细碎交易,并不得收其算”D. “商贾捐资,建设会馆,便往还而通贸易”4.隋至唐前期的中书门下是决策首脑机关,从不负担琐碎事务.唐代中后期至宋代的中书门下承担了大量的日常政务性工作,出现了中枢机构政务化的趋向.宋代的设官分职方式,在“从睉芜杂"的表象背后,突出了国家政务的核心内容.上述变化主要表明A.吏治渐趋清廉化 B.部门间关系更融洽C.官员日趋专业化 D.中央集权显著加强5.飞钱又称“便换",是中国早期的汇兑业务。
广东省佛山一中高三10月月考数学文试题 含答案
10月段考数学(文)试题1.已知集合{}{}2540,1,2,3,4,M x Z x x N =∈-+<=则MN = ( )A .{}1,2,3B .{}2,3,4C .{}2,3D .{}1,2,4 2.函数x y 2sin =的图象向右平移4π个单位,再向上平移1个单位,所得函数图象对应的解析式为 ( ) A .1)42sin(+-=πx y B . x y 2sin 2= C . x y 2cos -= D . x y 2cos 2=3.已知数列{}n a 的通项公式是3122n n n a n n +⎧=⎨-⎩(奇数)(为偶数),则23a a = ( )A . 70B . 28C . 20D . 84. 已知0a b >>,则下列不等式中总成立的是 ( ) A .11a b b a +>+ B . 11a b a b +>+ C . 11b b a a +>+ D . 11b a b a->- 5.在平面直角坐标系中,O 为原点,已知两点)3,1(),1,3(-B A ,若C 满足OB OA OC βα+=其中R ∈βα,且1=+βα,则点C 的轨迹方程是 ( ) A .052=-+y x B .5)2()1(22=-+-y x C .02=-y xD . 01123=-+y x6.已知向量p ()2,3=-,q (),6x =,且//p q ,则+p q 的值为 ( )A 5B .13C . 5D .137.已知两命题:p []0,1,xx a e ∀∈≥,命题:q 2,40x R x x a ∃∈-+=,均是真命题,则实数a 的取值范围是 ( ) A .[4,)+∞B .[1,4]C .[,4]eD .(,1]-∞8.已知函数1,(0)()0,(0)1,(0)x f x x x >⎧⎪==⎨⎪-<⎩,设2()()F x x f x =⋅,则()F x 是 ( )A. 奇函数,在(,)-∞+∞上单调递减B. 奇函数,在(,)-∞+∞上单调递增C. 偶函数,在(,0)-∞上递减,在(0,)+∞上递增D. 偶函数,在(,0)-∞上递增,在(0,)+∞上递减 9.曲线y =212x x +在点(2,4)处的切线与坐标轴围成的三角形面积为 ( )A .1B .2C .43 D .2310.已知函数1|1|,[2,0]()2(2),(0,)x x f x f x x -+∈-⎧=⎨-∈+∞⎩,若方程()f x x a =+在区间[2,4]-内有3个不等实根,则实数a 的取值范围是 ( ) A .{|20}a a -<< B . {|20}a a -<≤ C .{|20a a -<<或12}a << D .{02<<-a a 或1}a = 11.方程cos 0x x =在区间[]3,6-上解的个数为 12.已知锐角三角形的边长分别为2,4,x ,则x 的取值范围为 . 13. 已知α,β∈),43(ππ,sn(α+β)=-35,sin )4(πβ-=1213,则cos )4(πα+=________. 14.设→→b a ,为不共线的两个向量,且b a 2+与b a -2垂直,→→→-a b a 与垂直,则a 与b 的夹角的余弦值为____________.15.(12分) 已知函数2()2sin 1f x x x θ=+-,31[,]22x ∈-, (1)当6πθ=时,求()f x 的最大值和最小值;(2)若()f x 在31[,]22x ∈-上是单调增函数,且[0,2)θπ∈,求θ的取值范围.16.(12分)在ABC ∆中,角,,A B C 的对边分别为,,a b c ,且.222bc a c b =-+ (1)求角A 的大小;(2)若2=b ,且ABC ∆的面积为32=S ,求a 的值.17.(14分)已知向量a =)sin ,(cos θθ,],0[πθ∈,向量b =(3,-1) (1)若a b ⊥,求θ的值; (2)若2a b m -<恒成立,求实数m 的取值范围。
2020届广东省佛山市第一中学高三上学期10月月考物理试题(解析版)
佛山一中高三10月份月考试题物理一、单选题1.如图所示为杂技表演的安全网示意图,网绳的结构为正方格形,O 、a 、b 、c 、d为网绳的结点,安全网水平张紧后,若质量为的运动员从高处落下,并恰好落在O 点上,该处下凹至最低点时,网绳dOe ,bOg 均成120°向上的张角,若此时O 点受到的向下的冲击力大小为F ,则此时O 点周围每根网绳承受的力的大小为( )A. FB.2F C. F mg +D.2F mg+ 【答案】B 【解析】【详解】选O 点为研究对象,由平衡条件得4cos60T F ︒=得绳中弹力大小为2T F =A. F 与上述计算结果 2T F=不相符,故A 错误; B. 2F 与上述计算结果 2T F=相符,故B 正确;C. F mg +与上述计算结果 2T F=不相符,故C 错误。
D. 2F mg+与上述计算结果 2T F =不相符,故D 错误。
2.一固定杆与水平方向夹角为37θ︒=,将一质量为m 1的滑块套在杆上,通过轻绳悬挂一个质量为m 2的小球,杆与滑块之间的动摩擦因数为μ=0.5.若滑块与小球保持相对静止以相同的加速度a=10m/s 2一起向上做匀减速直线运动,则此时小球的位置可能是下图中的哪一个( )A. B.C. D.【答案】D【解析】【详解】把滑块和球看做一个整体受力分析,沿斜面和垂直斜面建立直角坐标系得,因速度方向向上,则沿斜面方向:(m1+m2)g sin 37°+f=(m1+m2)a垂直斜面方向:F N=(m1+m2)g cos37°;摩擦力:f=μF N联立可解得:a=g sin37°+μg cos37°=10m/s2设绳子与竖起方向夹角为β;对小球有若绳子与竖起方向夹角为37°,gsin37°=6m/s2现有:a= g sinβ>g sin37°,则有β>37°。
ABC.三个图形均与结论不相符,则ABC错误;D.该图与结论相符,选项D正确。
广东省佛山一中2020届高三上学期10月月考物理答案
联立解得T=4mg
17.(1)A→C过程,由机械能守恒定律得: ,解得:vc=14m/s
(2)在C点,由牛顿第二定律有: ,解得:Fc=3936N,由牛顿第三定律知,运动员在C点时轨道受到的压力大小为3936N
(3)设在空中飞行时间为t,则有:水平方向 ,竖直方向 ,且 ,解得:t=2.5s,t=-0.4s(舍去)。
根据牛顿第二定律,得Tsin60°=mω2Lsin60°①
mg=N+Tcos60° ②
又
解得T=mg,
(2)设小球对桌面恰好无压力时角速度为ω0,即N=0
代入①②得
由于 >ω0,故小球离开桌面做匀速圆周运动,则N=0此时小球的受力如图2.设绳子与竖直方向的夹角为θ,则有mgtanθ=mω2•Lsinθ③
绝密★启用前
广东省佛山一中2020届高三年级上学期10月月考
物理Байду номын сангаас题答案
选择题
1
2
3
4
5
6
7
8
9
10
11
12
13
B
D
B
C
C
A
A
A
AD
AB
ACD
BC
ABC
填空题
14.200;甲;4.00
15. BD ; 1.60 ; 0.02 ;小;M»m
16.【解析】试题分析:(1)对小球受力分析,作出力图如图1.
18.(1)设滑块第一次到达B处的速度为v1,对滑块从D到B的过程,根据动能定理得
mgh-μmgL2=
解得,v1=
(2)滑块从B到O过程,由能量守恒定律得
EP= -μmg(L1-x)
广东省佛山市第一中学2020届高三数学上学期10月月考试题文(含解析)
广东省佛山市第一中学2020届高三数学上学期10月月考试题 文(含解析)本试题卷共4页,22题. 全卷满分150分,考试用时120分钟. 一、选择题(本大题共12小题,每题5分,共60分) 1.已知复数2a ii+-是纯虚数(i 是虚数单位),则,实数a 等于 A. -2 B. 2C.12D. -1【答案】C 【解析】2a i i +-21255a a i -+=+是纯虚数,所以21210,0552a a a -+=≠∴=,选C.2.已知全集U R =,集合{}|11A x x =-<,25|11x B x x -⎧⎫=≥⎨⎬-⎩⎭,则()U A B ⋂=ð( ) A. {}12x x << B. {}12x x <≤ C. {}12x x ≤< D. {}14x x ≤<【答案】C 【解析】 【分析】分别解绝对值不等式与分式不等式求得集合A,B,再求得U B ð,及U A B ⋂ð。
【详解】由题意得{}{}{}|1111102A x x x x x x =-<=-<-<=<<,{}25410|1411x x B x x x x x x x ⎧⎫⎧⎫--=≥=≥=<≥⎨⎬⎨⎬--⎩⎭⎩⎭或,∴{}14U B x x =≤<ð,∴(){}12U A B x x ⋂=≤<ð.故选C .【点睛】集合与集合运算,一般先化简集合到最简形式,如果两个集合都是连续型数集,则常利用数轴求集合运算结果,如果是离散型集合运算常运用枚举法或韦恩图。
3.已知各项都为正数的等比数列{}n a 的前n 项和为n S ,若37256a a =,4212S S -=,则6S =( ) A. 31 B. 32 C. 63 D. 64【答案】C 【解析】 【分析】由等比数列的性质,求得516a =,再由3412a a +=,求得公比2q =,最后利用等比数列的求和公式,即可求解.【详解】由题意,在等比数列{}n a 中,因为37256a a =,得2375256a a a ==,解得516a =,又由42S S 12-=,得3412a a +=. 设等比数列{}n a 的公比为q (0q >), 则553422161612a a a a q q q q +=+=+=,解得23q =-(舍去)或2q =, 所以51441612a q a ===.所以()661126312S ⨯-==-. 故选C.【点睛】本题主要考查了等比数列的通项公式和性质的应用,以及等比数列的求和,其中解答中熟记等比数列的通项公式和性质,求得等比数列的公式是解答的关键,着重考查了运算与求解能力,属于基础题.4.等差数列{}n a 中,12019a =,2019201516a a =-,则数列{}n a 的前n 项和n S 取得最大值时n 的值为( )A. 504B. 505C. 506D. 507【答案】B 【解析】 【分析】先根据已知求得数列{}n a 的公差4d =-,再利用等差数列正负交界法求数列{}n a 的前n 项和n S 取得最大值时n 的值.【详解】∵数列{}n a 为等差数列,2019201516a a =-,∴数列{}n a 的公差4d =-,∴()1120234n a a n d n =+-=-,令0n a ≥,得20234n ≤. 又*n N ∈,∴n S 取最大值时n 的值为505. 故选:B【点睛】本题主要考查等差数列的基本量的计算和等差数列的通项的求法,考查等差数列前n 项和最值的求法,意在考查学生对这些知识的理解掌握水平和分析推理计算能力.5.已知函数1()ln 1f x x x =--,则=()y f x 的图象大致为( )A. B.C. D.【答案】A 【解析】 【分析】利用特殊值,对函数图象进行排除,由此得出正确选项.【详解】由于12201112ln 1ln 2222f ⎛⎫==> ⎪⎝⎭---,排除B 选项. 由于()()2222,23f e f e e e ==--,()()2f e f e >,函数单调递减,排除C 选项.由于()10010020101f ee=>-,排除D 选项.故选A. 【点睛】本小题主要考查已知具体函数的解析式,判断函数的图象,属于基础题.6.已知函数()f x 满足()()f x f x =-,且当(],0x ∈-∞时,()()0f x xf x '+<成立,若()()0.60.622a f =⋅,()()ln2ln2b f =⋅,118822log log c f ⎛⎫⎛⎫=⋅⎪ ⎪⎝⎭⎝⎭,则a ,b ,c 的大小关系是( ) A. a b c >> B. a c b >>C. c b a >>D. c a b >>【答案】C 【解析】 【分析】根据题意,构造函数h (x )=xf (x ),则a =h (20.6),b =h (ln 2),c =(218log )•f (218log )=h (﹣3),分析可得h (x )为奇函数且在(﹣∞,0)上为减函数,进而分析可得h (x )在(0,+∞)上为减函数,分析有218log <0<ln 2<1<20.6,结合函数的单调性分析可得答案. 【详解】解:根据题意,令h (x )=xf (x ),h (﹣x )=(﹣x )f (﹣x )=﹣xf (x )=﹣h (x ),则h (x )为奇函数;当x ∈(﹣∞,0)时,h ′(x )=f (x )+xf '(x )<0,则h (x )在(﹣∞,0)上为减函数,又由函数h (x )为奇函数,则h (x )在(0,+∞)上为减函数, 所以h (x )在R 上为减函数,a =(20.6)•f (20.6)=h (20.6),b =(ln 2)•f (ln 2)=h (ln 2),c =(218log )•f (218log )=h (218log )=h (﹣3), 因为218log <0<ln 2<1<20.6,则有c b a >>; 故选:C .【点睛】本题考查函数奇偶性与单调性的综合应用,关键是构造函数h (x )=xf (x ),并分析h (x )的奇偶性与单调性.7.一个几何体的三视图如图所示,则该几何体的体积是( )A.23B.13C.43D. 83【答案】A 【解析】 【分析】由三视图可知:该几何体为三棱锥P ﹣ABC ,过点P 作PD ⊥底面ABC ,垂足D 在AC 的延长线上,且BD ⊥AD .由题中数据及锥体体积公式即可得出.【详解】由三视图可知:该几何体为三棱锥P ABC -(如图),过点P 作PD ⊥底面ABC ,垂足D 在AC 的延长线上,且BD AD ⊥,1AC CD ==,2BD =,2PD =,∴该几何体的体积112122323V =⨯⨯⨯⨯=.故选A .【点睛】本题考查了三棱锥的三视图、体积计算公式,考查了推理能力与计算能力,属于中档题.8.3sin ,0,332ππαα⎛⎫⎛⎫-=∈ ⎪ ⎪⎝⎭⎝⎭,则cos 26πα⎛⎫-= ⎪⎝⎭( )【答案】D【解析】【分析】先由诱导公式得到2cos2263sinππαα⎛⎫⎛⎫-=-⎪ ⎪⎝⎭⎝⎭,并计算出cos3πα⎛⎫-⎪⎝⎭,再由二倍角公式计算223sinπα⎛⎫-⎪⎝⎭即可.【详解】由02πα∈(,),则363πππα-∈-(,),所以cos03πα⎛⎫->⎪⎝⎭,所以cos33πα⎛⎫-=⎪⎝⎭,又22cos2cos222sin62333sinπππππαααα⎡⎤⎛⎫⎛⎫⎛⎫⎛⎫-=--=-=-⎪ ⎪ ⎪ ⎪⎢⎥⎝⎭⎝⎭⎝⎭⎝⎭⎣⎦cos3πα⎛⎫-⎪⎝⎭=2333⨯⨯=,故选D.【点睛】本题考查了诱导公式的运用,考查了二倍角公式的应用,考查了角的配凑技巧,属于基础题.9.将函数()f x的图象向右平移6π个单位长度,再将所得函数图象上的所有点的横坐标缩短到原来的23,得到函数()()sin(0,0,)2g x A x Aπωϕωϕ=+>><的图象.已知函数()g x 的部分图象如图所示,则函数()f x()A. 最小正周期为23π,最大值为2 B. 最小正周期π,图象关于点,06π⎛⎫⎪⎝⎭中心对称 C. 最小正周期为23π,图象关于直线6x π=对称 D. 最小正周期为π,在区间,63ππ⎡⎤⎢⎥⎣⎦单调递减【答案】D 【解析】 【分析】先根据函数的图像求出()2sin 36g x x π⎛⎫=- ⎪⎝⎭,再求出()2sin 2x 6f x π⎛⎫=+ ⎪⎝⎭.利用函数的最小正周期否定选项A,C,再求函数f(x)的对称中心否定选项B,再求函数f(x)的单调区间确定选项D 是真命题.【详解】由图可知,2A =,2249183T πππ⎛⎫=-= ⎪⎝⎭,∴23T πω==. 又由229g π⎛⎫=⎪⎝⎭可得26k πϕπ=-+,k Z ∈,而2πϕ<,∴6πϕ=-. ∴()2sin 36g x x π⎛⎫=-⎪⎝⎭,∴()2sin 2x 6f x π⎛⎫=+⎪⎝⎭. ∴()f x 的最小正周期为π,选项A ,C 错误.对于选项B,令2x 6π+=kπ(k∈z),所以x=2k π-12π,所以函数f(x)的对称中心为(2k π-012,π)(k∈z),所以选项B 是错误的;又当,63x ππ⎡⎤∈⎢⎥⎣⎦时,52,626x πππ⎡⎤+∈⎢⎥⎣⎦,所以()f x 在,63ππ⎡⎤⎢⎥⎣⎦是减函数,所以选项D 正确.故选:D.【点睛】本题主要考查三角函数解析式的求法,考查三角函数的图像和性质,意在考查学生对这些知识的理解掌握水平和分析推理能力.10.若函数()sin (0)6f x x πωω⎛⎫=-> ⎪⎝⎭在[0,]π上的值域为1,12⎡⎤-⎢⎥⎣⎦,则ω的最小值为( ) A.23B.34C.43D.32【答案】A 【解析】 【分析】要使()f x 的值域为1,12⎡⎤-⎢⎥⎣⎦,得到x 的范围要求,则6x πω-要在其范围内,然后得到ω的范围,找到最小值.【详解】0x Q π≤≤666x πππωωπ∴-≤-≤-而()f x 值域为1,12⎡⎤-⎢⎥⎣⎦,发现()10sin 62f π⎛⎫=-=- ⎪⎝⎭5266πππωπ∴≤-≤, 整理得213ω≤≤, 则ω最小值为23,选A 项.【点睛】本题考查正弦型函数图像与性质,数形结合的数学思想,属于中档题.11.定义在R 上的偶函数()f x 满足(3)()f x f x -=-,对12,[0,3]x x ∀∈且12x x ≠,都有1212()()0f x f x x x ->-,则有( )A. (49)(64)(81)f f f <<B. (49)(81)(64)f f f <<C. (64)(49)(81)f f f <<D. (64)(81)(49)f f f << 【答案】A 【解析】试题分析:因为(3)()f x f x -=-,所以()(6)(3)f x f x f x -=--=,及()f x 是周期为6的函数,结合()f x 是偶函数可得,()()()()()(49)1,(64)22,(81)33f f f f f f f f ==-==-=,再由12,[0,3]x x ∀∈且12x x ≠,1212()()0f x f x x x ->-得()f x 在[0,3]上递增,因此(1)(2)(3)f f f <<,即(49)(64)(81)f f f <<,故选A .考点:1、函数的周期性;2、奇偶性与单调性的综合.12.设函数4310()log 0x x f x x x ⎧+≤⎪=⎨>⎪⎩,,,若关于x 的方程2()(2)()30f x a f x -++=恰好有六个不同的实数解,则实数a 的取值范围为( )A. (22)-B. 32]2,C. 3,2⎡⎫+∞⎪⎢⎣⎭D.2,)+∞【答案】B 【解析】作出函数()431,0log ,0x x f x x x ⎧+≤⎪=⎨>⎪⎩的图象如图,令()f x t =,则方程()()()2230f x a f x -++=化为()2230t a t -++=,要使关于x 的方程()()()2230f x a f x -++=,恰好有六个不同的实数根,则方程()()()2230f x a f x -++=在(]1,2内有两个不同实数根,()()()222212021221213022230a a a a ⎧∆=+->⎪+⎪<<⎪∴⎨⎪-+⨯+>⎪-+⨯+≥⎪⎩,解得3232,2a <≤∴实数a 的取值范围是3232,2⎛⎤ ⎥⎝⎦,故选B.【方法点睛】已知函数有零点(方程有根)求参数取值范围的三种常用的方法:(1)直接法:直接根据题设条件构建关于参数的不等式,再通过解不等式确定参数范围;(2)分离参数法:先将参数分离,转化成求函数值域问题加以解决;(3)数形结合法:先对解析式变形,在同一平面直角坐标系中,画出函数的图象,然后数形结合求解.一是转化为两个函数()(),y g x y h x ==的图象的交点个数问题,画出两个函数的图象,其交点的个数就是函数零点的个数,二是转化为(),y a y g x ==的交点个数的图象的交点个数问题 .二、填空题(本大题共4小题,每小题5分,共20分)13.已知等差数列{}n a 满足:37a =,5726a a +=.则数列{}n a 的前n 项和为n S = ▲ . 【答案】22n n + 【解析】 略14.21()sin cos 223f x x x π⎛⎫=+- ⎪⎝⎭在,34ππ⎡⎤-⎢⎥⎣⎦上的单调增区间为________. 【答案】[,]64ππ-【解析】 【分析】由题意利用二倍角公式及两角差的正弦公式化简函数的解析式,再利用正弦函数的单调性,得出结论.【详解】211cos 21()sin cos(2)cos 2223244x f x x x x x π-=+-=++111112cos 2)sin(2)222262x x x π=-+=-+. ,34x ππ⎡⎤∈-⎢⎥⎣⎦Q ,52,663x πππ⎡⎤∴-∈-⎢⎥⎣⎦,当2,623x πππ⎡⎤-∈-⎢⎥⎣⎦即,64x ππ⎡⎤∈-⎢⎥⎣⎦时,()f x 单调递增, ()f x ∴的单调递增区间为,64ππ⎡⎤-⎢⎥⎣⎦【点睛】本题主要考查二倍角公式及两角差的正弦公式的应用,正弦函数的单调性,属于基础题.15.已知曲线1C :xy e =与曲线2C :2()y x a =+,若两条曲线在交点处有相同的切线,则实数a 的值为__________. 【答案】22ln 2- 【解析】设交点为(,)tt e ,则切线斜率为222(),()(),4,2t t t tte e t a e t a e e =+=+∴==Q22ln 422ln 2a t ∴=-=-=-16.已知数列{}n a ,12a =,n S 为数列{}n a 的前n 项的和,且对任意2n ≥,都有221nn n na a S S =-,则{}n a 的通项公式为_____. 【答案】2,12,2(1)n n a n n n =⎧⎪=⎨-≥⎪-⎩【解析】 【分析】当n 2≥时,由n 2n n n n n 12a 1111a S S S S 2得-=-=-.所以n 1S ⎧⎫⎨⎬⎩⎭是以12为首项,12为公差的等差数列,求出2n S n=,再利用项和公式求得{}n a 的通项公式. 【详解】当2n ≥时,由()()1221221n n nn n n n n n n S S a a S S S S S S ---=⇒--- ()111211112n n n nn n S S S S S S ----==⇒-=-. 又111112S a ==,∴1n S ⎧⎫⎨⎬⎩⎭是以12为首项,12为公差的等差数列. ∴12n n S =,∴2n S n=,当2n ≥时,∴()122211n n n a S S n n n n -=-=-=---, 所以()2,12,21n n a n n n =⎧⎪=⎨-≥⎪-⎩. 故答案为:()2,12,21n n a n n n =⎧⎪=⎨-≥⎪-⎩【点睛】本题主要考查数列通项的求法,考查n S 与n a 的关系,意在考查学生对这些知识的理解掌握水平和分析推理能力.三、解答题(本大题共6小题,其中17-21每题12分,第22题10分,共70分)17.在ABC ∆中,内角A ,B ,C 所对的边分别是a ,b ,c ,已知sin sin sin a b a cC A B+-=-. Ⅰ.求:角B ; Ⅱ.若3b =,cos A =求:ABC ∆的面积. 【答案】I.3B π=;II.ABC S ∆=【解析】 【分析】I.根据正弦定理化简边角关系式,构造出cos B 的形式,求得cos B ,从而得到B ;II.由同角三角函数关系求得sin A ,用正弦定理求得a ,再利用()sin sin C A B =+求得sin C ,代入三角形面积公式求得结果. 【详解】I.由正弦定理可得:a b a cc a b+-=-,即222a b ac c -=- 整理可得:222a c b ac +-=则2221cos 22a cb B ac +-==()0,B π∈Q 3B π∴=II.由cos A =得:sin A =由正弦定理sin sin a b A B=可得:3sin 2sin b Aa B === 又()1sin sin sin cos cos sin 32326C A B A B A B =+=+=11sin 232262ABC S ab C ∆∴==⨯⨯⨯=【点睛】本题考查正弦定理、余弦定理的应用、两角和差的正弦公式应用、三角形面积公式的应用,熟练应用定理和公式进行边角关系式的化简和未知量的求解是解题的关键,属于常规题型.18.已知函数()sin()3f x A x πϕ=+,x∈R ,0A >,02πϕ<<.()y f x =的部分图象,如图所示,P 、Q 分别为该图象的最高点和最低点,点P 的坐标为(1,)A .(1)求()f x 的最小正周期及ϕ的值; (2)若点R 的坐标为(1,0),,求A 的值.【答案】(1)6,6π;(2)3. 【解析】【详解】(1)由题意得T =23ππ=6.因为P(1,A)在y =Asin 3x πϕ⎛⎫+⎪⎝⎭的图象上, 所以sin 3πϕ⎛⎫+ ⎪⎝⎭=1.因为0<φ<2π,所以φ=6π.(2)设点Q 的坐标为(x 0,-A).由题意可知3πx 0+6π=32π,得x 0=4,所以Q(4,-A).连结PQ ,在△PRQ 中,∠PRQ =23π,由余弦定理得 cos ∠PRQ =222222212229RP RQ PQ RP RQ A A⋅⋅+-++-(+)==-+,解得A 2=3.又A>0,所以A 319.已知数列{}n a 的前n 项和为n S ,且1(1)n n S na n n +=++.等比数列{}n b 中,12b a =,25b a =,36b a =.(Ⅰ)求数列{}n a 、{}n b 的通项公式; (Ⅱ)若n n n c a b =,求数列{}n c 的前n 项和n T .【答案】(Ⅰ) 313n n b -⎛⎫= ⎪⎝⎭;(Ⅱ) 31135(5)3n n T n -⎛⎫=+-⋅ ⎪⎝⎭【解析】 【分析】(Ⅰ)将n 换为n ﹣1,相减,由数列的递推式和等差数列的定义,以及等比数列的中项性质和通项公式,计算可得所求通项公式; (Ⅱ)求得c n =a n b n =(13﹣2n )•(13)n ﹣3,由数列的错位相减法求和,结合等比数列的求和公式,计算可得所求和.【详解】(Ⅰ)1(1)n n S na n n +=++, 当2n ≥时,1(1)(1)n n S n a n n -=-+-,两式相减可得11(1)(1)(1)n n n n S S na n a n n n n -+=--++--- 可得1(1)2n n n a na n a n +=--+,即为12n n na na n +-=-,即为12n n a a +-=-, 当1n =时,1122a S a ==+,也满足上式, 则数列{}n a 为公差为2-的等差数列, 等比数列{}n b 中,12b a =,25b a =,36b a =.可得2213b b b =,即2526a a a =,即有()()()21118210a a a -=--,解得111a =,则112(1)132n a n n ==﹣﹣﹣; 由129b a ==,253b a ==,361b a ==,可得公比13q =, 即313n n b -⎛⎫= ⎪⎝⎭;(Ⅱ)31(132)3n n n n c a b n -⎛⎫==-⋅ ⎪⎝⎭,可得前n 项和213111119(132)333n n T n ---⎛⎫⎛⎫⎛⎫=⋅+⋅+⋯+-⋅ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭,121111119(132)3333n n T n --⎛⎫⎛⎫⎛⎫=⋅+⋅+⋯+-⋅ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭,相减可得21322111111(2)(132)33333n n n T n ----⎡⎤⎛⎫⎛⎫⎛⎫⎛⎫=⋅+-++--⋅⎢⎥ ⎪ ⎪ ⎪ ⎪⎝⎭⎝⎭⎝⎭⎝⎭⎢⎥⎣⎦L2113113992(132)1313n n n --⎛⎫- ⎪⎛⎫⎝⎭=-⋅--⋅ ⎪⎝⎭-, 化简可得31135(5)3n n T n -⎛⎫=+-⋅ ⎪⎝⎭.【点睛】本题考查数列的递推式的运用,考查等比数列的通项公式和求和公式的运用,考查数列的错位相减法,考查化简整理的运算能力,属于中档题.20.已知数列{}n a 的前n 项和为n S ,且满足*32,()n n a S n n N =+∈,(1)求数列{}n a 的通项公式;(2)记3(1)log (21)nn n b a =-⋅+,数列{}n b 的前n 项和为n T ,求n T .【答案】(1) *113,()22n n a n N =⋅-∈;(2)见解析 【解析】【分析】(1)将n 换为n ﹣1,相减,得:a n =3a n ﹣1+1,然后证明数列{12n a +}是以32为首项,3为公比的等比数列.求出通项公式.(2)通过递推关系式求出数列的通项公式,利用分组求和法分n 为奇偶求解数列的和即可. 【详解】(1)当1n =时,11321a a =+,11a ∴= 当2n ≥时,32n n a S n =+,11321n n a S n --=+-,两式相减得:13321n n n a a a --=+ 131n n a a -∴=+1113()22n n a a -∴+=+ 111113()33222n n n a a --∴+=+⋅=⋅11322n n a ∴=⋅-1n =时也符合上式,*113,()22n n a n N ∴=⋅-∈(2)3(1)log (21)n n n b a =-⋅+Q ,(1)nn b n ∴=-⋅∴当n 为偶数时,(12)(34)[(1)]12n n T n n =-++-++--+=⋅L 当n 为奇数时,11122n n n n n T T b n ----=+=-= 【点睛】本题考查数列的递推关系式的应用,考查了数列求和,考查转化思想以及计算能力.21.设函数1()eln x f x a x -=-,其中e 为自然对数的底数.(1)若1a =,求()f x 的单调区间; (2)若0e a ≤≤,求证:()f x 无零点.【答案】(1)()f x 的单调递减区间为()0,1,单调递增区间为()1,+∞ ;(2)详见解析. 【解析】 【分析】(1)求导函数,利用导数的正负,可得函数的单调递增区间与单调递减区间; (2)分类讨论,利用导数研究函数的单调性,求得函数的值域,从而证得结果.【详解】(1)若1a =,则()1e ln (0)xf x x x -=->,∴()1e 1'(0)x x f x x x--=>.令()1e1(0)x t x x x -=->,则()()1'1e (0)x t x x x -=+>,当0x >时,()'0t x >,即()t x 单调递增,又()10t =, ∴当()0,1x ∈时,()()()0,'0,t x f x f x <<单调递减, 当()1,x ∈+∞时,()()()0,'0,t x f x f x >>单调递增. ∴()f x 的单调递减区间为()0,1,单调递增区间为()1,+∞. (2)当0a =时,()1e 0xf x -=>,显然()f x 无零点.当0e a <≤时,(i)当01x <≤时,()1ln 0,ln 0,eln 0x x a x f x a x -≤≤=->,显然()f x 无零点.(ii)当1x >时,易证0ln 1x x <<-,∴()()ln 1e 1a x a x x <-≤-, ∴()()11e ln e e 1x x f x a x x --=->--. 令()()1ee 1x g x x -=--,则()1e e x g x -'=-,令()0g x '=,得2x =,当12x <<时,()0g x '<;当2x >时,()0g x '>, 故min ()(2)0g x g ==,从而()0f x >,显然()f x 无零点.综上,()f x 无零点. 【点睛】该题考查的是有关导数的应用问题,涉及到的知识点有利用导数研究函数的单调性,利用导数求函数的值域证得函数没有零点,属于较难题目.22.在直角坐标系xOy 中,曲线1C 的参数方程为sin x y αα⎧=⎪⎨=⎪⎩(α为参数),以坐标原点为极点,以x 轴正半轴为极轴,建立极坐标系,曲线2C 的极坐标方程为sin()4ρθπ+=. (1)写出1C 的普通方程和2C 的直角坐标方程;(2)设点P 在1C 上,点Q 在2C 上,求PQ 的最小值以及此时P 的直角坐标.【答案】(1)1C :2213x y +=,2C :40x y +-=;(2)minPQ =31(,)22P . 【解析】试题分析:(1)1C 的普通方程为2213x y +=,2C 的直角坐标方程为40x y +-=;(2)由题意,可设点P 的直角坐标为,sin )αα⇒P 到2C 的距离π()sin()2|3d αα==+-⇒当且仅当π2π()6k k α=+∈Z 时,()d α,此时P 的直角坐标为31(,)22.试题解析: (1)1C 的普通方程为2213x y +=,2C 的直角坐标方程为40x y +-=.(2)由题意,可设点P 的直角坐标为,sin )αα,因为2C 是直线,所以||PQ 的最小值即为P 到2C 的距离()d α的最小值,π()sin()2|3d αα==+-.当且仅当π2π()6k k α=+∈Z 时,()d α,此时P 的直角坐标为31(,)22. 考点:坐标系与参数方程.【方法点睛】参数方程与普通方程的互化:把参数方程化为普通方程,需要根据其结构特征,选取适当的消参方法,常见的消参方法有:代入消参法;加减消参法;平方和(差)消参法;乘法消参法;混合消参法等.把曲线C 的普通方程0(),F x y =化为参数方程的关键:一是适当选取参数;二是确保互化前后方程的等价性.注意方程中的参数的变化范围.。
2020届10月份考试答案(1)
佛山一中2020届高三10月份月考答案物理1 2 3 4 5 6 7 8 9 10 11 12 13B D BC C A A A AD AB ACD BC ABC填空题14. 200 ;甲; 4.0015. BD ; 1.60 ; 0.02 ; 小;M»m16.【解析】试题分析:(1)对小球受力分析,作出力图如图1.根据牛顿第二定律,得Tsin60°=mω2Lsin60°①mg=N+Tcos60°②又ω1=√gL解得T=mg,N=mg2(2)设小球对桌面恰好无压力时角速度为ω0,即N=0代入①②得ω2=√4gL由于ω2=√4gL>ω0,故小球离开桌面做匀速圆周运动,则N=0此时小球的受力如图2.设绳子与竖直方向的夹角为θ,则有mgtanθ=mω2•Lsinθ③mg=Tcosθ ④联立解得T=4mg17.(1)A→C过程,由机械能守恒定律得:mg[ℎ1+R(1−cos37°)]=12mv C2,解得:v c=14m/s(2)在C点,由牛顿第二定律有:F C−mg=mv C2R,解得:F c=3936N,由牛顿第三定律知,运动员在C点时轨道受到的压力大小为3936N(3)设在空中飞行时间为t,则有:水平方向x=v c t,竖直方向ℎ=12gt2,且tan37∘=ℎ−ℎ2x,解得:t=2.5s,t=-0.4s(舍去)。
18.(1)设滑块第一次到达B 处的速度为v 1,对滑块从D 到B 的过程,根据动能定理得mgh -μmgL 2=12mv 12解得,v 1=√10m/s(2)滑块从B 到O 过程,由能量守恒定律得E P =12mv 12-μmg (L 1-x )解得,E P =2.75J(3)设滑块再次到达B 处的速度为v 2,对滑块第一次到达B 到再次到达B 的过程,根据动能定理得-2μmg (L 1-x )=12mv 22−12mv 12,解得v 2=1m /s <v =2m /s则知滑块再次滑上传送带后将匀加速运动,由牛顿第二定律得 μmg =ma ,得a =2.5m /s 2.速度增加到与传送带相同所经历的位移为 L =v 2−v 222a=0.6m <L 2=2m ,可知,滑块接着相对传送带静止,速度为v =2m /s 对从C 到最高点的过程,由动能定理得 -mgh ′=0-12mv 2解得,h ′=0.2m。
广东省佛山市第一中学2020届高三数学上学期10月月考试题文
广东省佛山市第一中学2020届高三数学上学期10月月考试题 文本试题卷共4页, 22题. 全卷满分150分,考试用时120分钟.第Ⅰ卷一、选择题(本大题共12小题,每题5分,共60分) 1.已知复数是纯虚数(i 是虚数单位),则实数a 等于( ) A.B. 2C.D.2.已知全集U =R ,集合A ={x ||x -1|<1},B ={x |≥1},则A ∩∁U B =( )A.B.C.D.3. 已知各项都为正数的等比数列{a n }的前n 项和为S n ,若a 3a 7=256,S 4﹣S 2=12,则S 6=( ) A .31B .32C .63D .644. 等差数列{a n }中,a 1=2019,a 2019=a 2015﹣16,则数列{a n }的前n 项和S n 取得最大值时n 的值为( ) A .504 B .505C .506D .5075.已知函数1ln 1)(--=x x x f ,则y =f (x )的图象大致为( )A. B. C. D.6.已知函数)(x f 满足)()(x f x f -=,且当]0,(-∞∈x 时,0)()('<+x xf x f 成立,若a =(20.6)•f (20.6),b =(ln2)•f (ln2),c =()•f (),则a ,b ,c 的大小关系是( ) A.B.C.D.7.一个几何体的三视图如图所示,则该几何体的体积是( )A.32 B. 31 C. 34 D. 388.)2,0(,33)3sin(πααπ∈=-,则=-)62cos(πα( )A.934 B. 934- C.322- D.322 9.将函数)(x f 的图象向右平移6π个单位长度,再将所得函数图象上的所有点的横坐标缩短到原来的32,得到函数)2,0,0)(sin()(πϕωϕω<>>+=A x A x g 的图象,已知函数)(x g 的部分图象如图所示,则函数)(x f ( )A ..最小正周期为32π,最大值为2B ..最小正周期为π,图象关于点)0,6(π中心对称C .最小正周期为32π,图象关于直线6π=x 对称 D .最小正周期为π,在区间]3,6[ππ单调递减10.若)0)(6sin()(>-=ωπωx x f 在],0[π上的值域为]1,21[-,则ω的最小值为( ) A.32 B.43 C.34 D.23 11.定义在R 上的偶函数)(x f 满足)()3(x f x f -=-,对]3,0[,21∈∀x x 且21x x ≠,都有0)()(2121>--x x x f x f ,则有( )A.)81()64()49(f f f <<B. )64()81()49(f f f <<C.)81()49()64(f f f <<D.)49()81()64(f f f << 12.设函数若关于的方程恰好有六个不同的实数解,则实数的取值范围为A. B.C.D.第Ⅱ卷二、填空题(本大题共4小题,每小题5分,共20分)13.已知等差数列{}n a 满足:,26,7753=+=a a a 则数列⎭⎬⎫⎩⎨⎧-112n a 的前n 项和为 .14.)32cos(21sin )(2π-+=x x x f 在]4,3[ππ-上的单调增区间为 . 15.已知曲线C 1:xe y =与曲线C 2:2)(a x y +=.若两个曲线在交点处有相同的切线,则实数a 的值为______.16. 已知数列{}n a ,21=a ,S n 为数列{}n a 的前n 项的和,且对任意n ≥2,都有122=-nn n nS S a a ,则{}n a 的通项公式为 .三、解答题(本大题共6小题,其中17-21每题12分,第22题10分,共70分) 17. 在△ABC 中,内角A ,B ,C 所对的边分别是a ,b ,c ,已知BA ca Cb a sin sin sin --=+. (Ⅰ)求角B ; (Ⅱ)若b =3,cos A =,求△ABC 的面积18 .已知函数π()sin()3f x A x ϕ=+,x ∈R ,0A >,π02ϕ<<.()y f x =的部分图象,如图所示,P 、Q 分别为该图象的最高点和最低点,点P 的坐标为(1,)A .(Ⅰ)求()f x 的最小正周期及ϕ的值; (Ⅱ)若点R 的坐标为(1,0),2π3PRQ ∠=,求A 的值.19.已知数列{a n }的前n 项和为S n ,且)1(1++=+n n na S n n .等比数列{b n }中,b 1=a 2,b 2=a 5,b 3=a 6.(Ⅰ)求数列{a n }、{b n }的通项公式;(Ⅱ)若n n n b a c =,求数列{c n }的前n 项和T n . 20.已知数列{}n a 的前n 项和为n S ,且满足)(,23*N n n S a n n ∈+=,(1)求数列{}n a 的通项公式;(2)记)12(log )1(3+⋅-=n nn a b ,数列{}n b 的前n 项和为n T ,求n T .21. 设函数x a ex f x ln )(1-=-,其中e 为自然对数的底数.(1)若a =1,求f (x )的单调区间; (2)若e a ≤≤0,求证:f (x )无零点.21.在直角坐标系xOy 中,曲线C 1的参数方程为(α为参数),以坐标原点为极点,以x 轴的正半轴为极轴,建立极坐标系,曲线C 2的极坐标方程为22)4sin(=+πθρ.(1)写出C 1的普通方程和C 2的直角坐标方程;(2)设点P 在C 1上,点Q 在C 2上,求|PQ |的最小值及此时P 的直角坐标.佛山一中2020届高三10月份月考答案文科数学CCCB ABAD DAAA13.)1(4+n n 14.]4,6[ππ- 15.2-ln4 16.2,)1(21,2≥⎪⎩⎪⎨⎧--==n n n n a n5.【答案】A 解:令g (x )=x -ln x -1,则x >0, 因为,由g '(x )>0,得x >1,即函数g (x )在(1,+∞)上单调递增, 由g '(x )<0,得0<x <1,即函数g (x )在(0,1)上单调递减, 所以当x =1时,函数g (x )有最小值,g (x )min =g (1)=0, 于是对任意的x ∈(0,1)∪(1,+∞),有g (x )>0, 则f (x )>0,故排除B 、D ,因函数g (x )在(0,1)上单调递减,则函数f (x )在(0,1)上递增,故排除C ,故选A .6.【答案】B 解: 根据题意,令,因为对成立, 所以,因此函数为R 上奇函数. 又因为当时,,所以函数在(-∞,0]上为减函数, 又因为函数为奇函数,所以函数在R 上为减函数, 因为,所以,即.故选B .7.【答案】A 解:由三视图可知:该几何体为三棱锥P -ABC (如图),过点P 作PD ⊥底面ABC ,垂足D 在AC 的延长线上,且BD ⊥AD ,AC =CD =1,BD =2,PD =2, ∴该几何体的体积V ==.故选A .9.【答案】D 解:根据函数的图象得到:A =2,T =,所以ω=.当x =时,φ)=0,所以φ=k π,由于,故φ=﹣,则,将所得函数图象上的所有点的横坐标扩大到原来的倍,所以,再将函数f (x )的图象向左平移个单位长度,得到f (x )=2sin (2x +),所以函数的最小正周期为π,故排除A 和C ,对于选项B ,当x =时,f ()=0,但是对称中心不止一个,故B 不正确.对于选项D ,令(k ∈Z ),得(k ∈Z ), 当k =0时单调递减区间为[],由于[],故选项D 正确.10.【答案】A解:根据题意,函数f (x )满足f (x -3)=-f (x ),所以f (x -6)=-f (x -3)=f (x ), 则函数f (x )是周期为6的函数,所以f (49)=f (1+6×8)=f (1), f (81)=f (-3+6×14)=f (-3),f (64)=f (-2+6×11)=f (-2),又由函数为偶函数,得f (81)=f (-3)=f (3),f (64)=f (-2)=f (2), 因为对∀x 1,x 2∈[0,3]且x 1≠x 2,都有>0,则函数f (x )在区间[0,3]上为增函数,进而有f (1)<f (2)<f (3),即f (49)<f (64)<f (81),故选:A . 11.【答案】A 666,0πωππωππ-≤-≤-∴≤≤x x ,)(x f 值域为]1,21[-,21)6sin()0(-=-=πf Z k k k ∈+≤-≤+∴,672622πππωπππ,整理得Z k k k ∈+≤≤+,342322ω,又0>ω,ω∴的最小值为32,故选A 。
2020届广东省佛山一中高三上学期10月月考数学(理)试题(解析版)
绝密★启用前广东省佛山市第一中学2020届高三年级上学期10月月考检测数学(理)试题(解析版)2019年10月一、选择题:本大题共12个小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.已知角θ的顶点与原点O 重合,始边与x 轴的正半轴重合,若它的终边经过点()()2,0P a a a ≠,则tan 24πθ⎛⎫+= ⎪⎝⎭( )A. -7B. 17-C.17D. 7【答案】A 【解析】 【分析】由角θ的终边经过点()()2,0P a a a ≠可求得tan θ值,再根据和差角公式展开tan 24πθ⎛⎫+ ⎪⎝⎭,可知需要再求解tan 2θ,用tan θ的二倍角公式求解即可。
【详解】因为角θ的终边经过点()()2,0P a a a ≠,可得1tan =22a a θ=,故22122tan 142tan 2=131tan 31()24θθθ⨯===--,所以41tan 2tan34tan 2=7441tan 2tan 143πθπθπθ++⎛⎫+==- ⎪⎝⎭-⨯-,故选A 。
【点睛】求解三角函数值时,重点观察角度的关系,判断需要选取的公式,如二倍角和差角等,进行公式的选择与运算。
2.已知命题:22x yp <,命题22:log log q x y <,则命题p 是命题q 的( )A. 充分不必要条件B. 必要不充分条件C. 充分必要条件D. 既不充分又不必要条件【答案】B 【解析】 【分析】利用指数不等式与对数不等式分别求出命题p ,q 的等价条件,再由充分条件与必要条件的定义进行判断即可。
【详解】命题:22x yp <等价于“x y <”,命题22:log log q x y <等价于“0x y <<”,所以命题p 是命题q 的必要不充分条件, 故答案选B【点睛】本题考查必要不充分条件的判定,解题的关键是求出命题p ,q 的等价条件,属于基础题。
广东省佛山市第一中学2020届高三英语10月月考试题(含解析)
广东省佛山市第一中学2020届高三英语10月月考试题(含解析)注意事项:1.答题前,考生务必用黑色笔迹的钢笔或签字笔将自己的姓名、考号填写在答题卷上。
2.每小题选出答案后,用2B铅笔把答题卷上对应题目选项的答案信息点涂黑;如需改动,用橡皮擦干净后,再选涂其他答案,答案不能答在试卷上。
非选择题必须用黑色字迹的钢笔或签字笔作答,答案必须写在答题卷各题目指定区域内相应位置上;如需改动,先划掉原来的答案,然后再写上新的答案;不准使用铅笔和涂改液。
不按以上要求作答的答案无效。
第一部分:阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。
AChester City Library offers a range of Library Special Needs services to people who don’t have access to our library service in the usual way. As long as you live in Chester City, we’ll provide a wide range of library services and resources including:Large printed and ordinary printed books Talking books on tape and CDDVDs and music CDs Magazines Reference and information requestsHome delivery serviceLet us know what you like to read and we will choose the resources for you. Our staff will deliver the resources to your home for free. We also provide a service where we can choose the resources for you or someone instead of you choose the things from the library. You can also choose the resources you need personally.Talking books and captioned videosThe library can provide talking books for people who are unable to use printed books because of eye diseases. You don’t have to miss out on reading any more whenyou can borrow talking books from the library. If you have limited hearing which prevents you from enjoying movies, we can provide captioned videos for you at no charge.Languages besides EnglishWe can provide books in a range of languages besides English. If possible, we will request these items from the State library of NSW, Australia.How to joinContact the library Special Needs Coordinator to register or discuss if you are suitable for any of the services we provide—Tuesday, Wednesday and Thursday 9 am—5 pm on 4297 2522 for more information.1. Library Special Needs Services are meant for ________.A. those who are fond of readingB. only those who have walking disabilitiesC. those who can’t get medical help in Chester CityD. people living in Chester City with an illness or disability2. Which of the following statement is TRUE ?A. Few entertaining resources are offered here.B. Books with different languages are available.C. People have to choose what they need by themselves.D. People with limited hearing have to pay for captioned videos.3. To get home delivery service, you must ________.A. only choose printed booksB. have others choose the resources for youC. pay the library ahead of timeD. register ahead of time【答案】1. D 2. B 3. D【解析】这是一篇应用文。
广东省佛山一中2020届高三上学期10月月考化学答案
(4)流速过快会导致ZnCl2被气流带出B区(2分)
(5)①容量瓶(1分)② (2分)
22.(16分)
(1)弱(2分)
(2)5CS32-+ 24MnO4-+ 52H+= 15SO42-+ 5CO2↑+ 24Mn2++ 26H2O(2分)
绝密★启用前
广东省佛山一中2020届高三年级上学期10月月考
化学试题参考答案
1
2
3
4
5
6
7
8
9
10
D
D
B
B
C
ACBiblioteka ACD11
12
13
14
15
16
17
18
19
20
B
A
C
B
A
D
C
C
B
D
21.(14分)
(1)ZnCl2+ H2O = Zn(OH)Cl + HCl(2分)
(2)Zn(OH)Cl + HCl ZnCl2+ H2O(2分)
(3)不同意,因为步骤③中加入的酸性KMnO4溶液是用H2SO4酸化的,含有SO42-,
所以生成的硫酸钡沉淀质量偏大(2分)
(4)分液漏斗(2分)排尽装置中的空气,防止生成的H2S被氧化(2分)
(5)Cu2++H2S= CuS↓+2H+(2分)
(6)过滤、洗涤、干燥(2分)1.75mol·L-1(2分)
(5)碳为固体,难以与钨分离(1分),且碳和钨在高温下会反应生成碳化钨(2分)
【解析】广东省佛山市第一中学2020届高三上学期10月月考数学(理)试题
佛山一中2020届高三年级十月考试题数学(理科)一、选择题:本大题共12个小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.已知角θ的顶点与原点O 重合,始边与x 轴的正半轴重合,若它的终边经过点()()2,0P a a a ≠,则tan 24πθ⎛⎫+= ⎪⎝⎭( ) A. -7 B. 17-C.17D. 7【答案】A 【分析】 由角θ的终边经过点()()2,0P a a a ≠可求得tan θ值,再根据和差角公式展开tan 24πθ⎛⎫+ ⎪⎝⎭,可知需要再求解tan 2θ,用tan θ的二倍角公式求解即可。
【详解】因为角θ的终边经过点()()2,0P a a a ≠,可得1tan =22a a θ=,故22122tan 142tan 2=131tan 31()24θθθ⨯===--,所以41tan 2tan34tan 2=7441tan 2tan 143πθπθπθ++⎛⎫+==- ⎪⎝⎭-⨯-,故选A 。
【点睛】求解三角函数值时,重点观察角度的关系,判断需要选取的公式,如二倍角和差角等,进行公式的选择与运算。
2.已知命题:22x yp <,命题22:log log q x y <,则命题p 是命题q 的( )A. 充分不必要条件B. 必要不充分条件C. 充分必要条件D. 既不充分又不必要条件【答案】B 【分析】利用指数不等式与对数不等式分别求出命题p ,q 的等价条件,再由充分条件与必要条件的定义进行判断即可。
【详解】命题:22x yp <等价于“x y <”,命题22:log log q x y <等价于“0x y <<”,所以命题p 是命题q 的必要不充分条件, 故答案选B【点睛】本题考查必要不充分条件的判定,解题的关键是求出命题p ,q 的等价条件,属于基础题。
3.在△ABC 中,角A ,B ,C 的对边分别为a ,b ,c ,且满足(b -a)sin A =(b -c)(sin B +sin C),则角C 等于( ) A.3π B.6π C.4π D.23π 【答案】A由题意得,(b -a )a =(b -c )(b +c ),∴ab =a 2+b 2-c 2,∴cos C ==,∴C =,故选A.4.若α,β为锐角,且2cos sin 63ππαβ⎛⎫⎛⎫-=+ ⎪ ⎪⎝⎭⎝⎭,则( ) A. 3παβ+=B. 6παβ+=C. 3παβ-=D.6παβ-=【答案】C 【分析】 由题2cos sin 63ππαβ⎛⎫⎛⎫-=+⎪ ⎪⎝⎭⎝⎭可将2sin 3πβ⎛⎫+ ⎪⎝⎭利用诱导公式化成余弦函数,再根据角度的范围进行求解。
广东省佛山一中2020届高三上学期10月月考地理试题及答案
绝密★启用前广东省佛山一中2020届高三年级上学期10月月考地理试题本试题卷共10页,44题。
全卷满分100分,考试用时90分钟。
第Ⅰ卷一、单选题:本题共40小题,每小题1.5分,共60分。
在每小题给出的四个选项中,只有一项是符合题目要求的。
我国某地一同学每天早晨在上学路上,习惯性地观察天空中的大阳。
下图示意该同学在两个不同日期的7:30(北京时间)经过P点时,所看到的太阳在天空中的a、b位置,图中M、N 代表南北方向,PQ垂于MN。
据此完成1~3题。
1.该同学所处的省区可能是A.甘肃B.上海市C.新疆 D.吉林2.该同学看到太阳位于a位置上升到b位置期间可能是A.6月到7月B.9月到10月C.2月到3月D.3月到4月3.如果该同学看到太阳又由b位置降到a位置时,当地A.昼短夜长B.昼渐短C.正午影子渐短 D.日出东南自秦代以来,中国就一直以立春作为春季的开始。
“春雨惊春清谷天”是春季的六个节气。
谷雨前后是牡丹盛开的时节,民谚便有“谷雨三朝看牡丹”的说法。
地处鲁西南的菏泽市(35°N,115°E)有“牡丹之乡”的美称。
据此完成4~5题。
4.菏泽牡丹最佳观赏时节期间,当地A.昼短夜长B.日出东南方向C.正午日影渐短D.夜长逐渐变长5.谷雨节气,菏泽市的正午太阳高度角约为A.55°B. 63°C. 78.5°D. 90°下图是以极点为中心的东半球图。
此刻,曲线MN上各点太阳高度为0°,MN与EP相交于N 点。
该季节,北美大陆等温线向南凸出。
读图回答6~7题。
6.由图文信息可知A.M位于N的西北方向B.悉尼正值少雨的季节C.此季节是南极考察的最佳时期D.这一天甲地日出时刻早于乙地7.图示时刻A.东经10°各地处于夜B.澳大利亚与巴西不在同一日C.全球属于夜的范围大于昼D.地球位于公转轨道远日点附近天津王先生的家是一个高层建筑的二楼,令他苦恼的是因为南楼遮挡,寒冬的正午直到1月16号阳光才能照射进阳台,朋友李先生家的顶楼阳台则没有这样的烦恼,但为了更好的采光晾晒衣服,李先生家的伸缩式晾衣架的高度在不同季节绳索距离楼顶的高度还是要调一调,据此回答8~9题。
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
佛山一中2020届高三10月份月考试题英语命题人:高三英语备课组审题人:高三英语备课组2019年10月本试卷共9页,52小题,全卷满分120分,考试用时120分钟。
注意事项:1.答题前,考生务必用黑色笔迹的钢笔或签字笔将自己的姓名、考号填写在答题卷上。
2.每小题选出答案后,用2B铅笔把答题卷上对应题目选项的答案信息点涂黑;如需改动,用橡皮擦干净后,再选涂其他答案,答案不能答在试卷上。
非选择题必须用黑色字迹的钢笔或签字笔作答,答案必须写在答题卷各题目指定区域内相应位置上;如需改动,先划掉原来的答案,然后再写上新的答案;不准使用铅笔和涂改液。
不按以上要求作答的答案无效。
第一部分:阅读理解(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。
APreschool Chinese Teacher(Julia Gabriel Centre & Chiltern House)•Candidate must possess at least a Bachelors’ Degree;•At least 2 years of full﹣time working experience in the related field;•Required Skills: Classroom management, Early Years Education, Art and Craft, Music, Microsoft Office, Storytelling, Drama, Lesson Planning;•Able to speak clear, standard Chinese;•Available in March 2019,Website: Telephone No: 03﹣2095 5500Full-time Chinese Teacher(Brainy Kids Learning Centre)•Candidate must possess at least a Post Graduate Diploma;•At least 3 years of full﹣time working experience in Chinese teaching;•Teacher Certificate is required if the applicant’s degree is not in Education;•international experience, especially in Asia, is highly valued;•Immediately available.Website: Telephone No: 03﹣62768755 Primary School Chinese Teacher(Nilai International School)•Candidate must have at least a Post Graduate Diploma;•A certificate in education is required;•At least 4 years’ full-time experience in teaching Chinese;•Computer literacy and excellent communication and interpersonal skills;•Able to start work in mid﹣September 2019.Website: .my Telephone No: 06﹣8500 2188 Part-Time Chinese Tutor(Mind Stretcher Education)•Candidate must possess at least a Bachelor’s Degree;•Must be expert in Chinese due to work nature;•Experience in teaching will have an added advantage;•Required Skills: Computer Skill,Microsoft Office;•Able to start work in July 2019.Website: .wty Telephone No: 603﹣798763661. Which offer suits you if you are not available until August 2019?A. Julia Gabriel Centre & Chiltern House.B. Brainy Kids Learning Centre.C. Nilai International School.D. Mind Stretcher Education.2. Which position is open to fresh graduates?A. Preschool Chinese Teacher.B. Full-time Chinese Teacher.C. Primary School Chinese Teacher.D. Part-Time Chinese Tutor.3. What’s the similar requirement of the four positions?A. Post Graduate Diploma.B. A good command of Chinese.C. International experience.D. Excellent computer skills.BI was 10 that year. One cold spring night after I sold my last copy of newspaper at 10:20, I hurried across the street to the flower shop just as Mr. Rocco was locking the door. “Please Mr. Rocco,” I begged, “Will you open up? I just have to have a flower. Mother’s Day is tomorrow. I want the most beautiful flower you have. I have a quarter and a dime!”Mr. Rocco stood there for the longest time, looking at me and rubbing his chin. Finally he nodded, and showed me a plant on the counter. “I can give you this for 35 cents. “But it looks like a weed! ”“Now trust me, boy -- I promise that tomorrow morning you will find your most beautiful flower. Now put this paper bag over it and don’t get your plant chilled(冻坏).” He cautioned.I ran home. Mom was sick with tuberculosis(肺结核)and using the front bedroom.She seemed to be asleep, so I quietly tiptoed (蹑手蹑脚)in and set the plant on the table beside her bed. I wanted her to be surprised when she woke on Mother’s day.The next morning when I looked into Mom’s room, she waved for me to come in and then glanced over the table where the plant was. Wow! There was a big yellow trumpet-shaped(喇叭状)flower. It was the most beautiful flower I ever saw! When I looked at Mom, she was smiling as tears streamed down her cheeks.She held out her hand for me to come near, then pulled me close and hugged till it hurt. Then, remembering her contagious condition and that she wasn’t supposed to touch me, she quickly let go.My dear mom died the next night, but the plant has been in blossom all along in my heart. That moment she hugged me turned out to be the most wonderful moment of my life. Not only had that beautiful plant helped show just how much I loved her, but I’d alwa ys know how much she loved me.4. When Mr. Rocco stood there for the longest time, he might be wondering ______.A. whether the plant could come into flower at allB. what he should say to refuse the boy’s requestC. whether he should believe what the boy had saidD. what flower would perfectly meet the boy’s need5. Why did the writer walk quietly into his Mom’s room?A. He wanted his gift out of his mother’s expectation.B. He didn’t want Mom to find his coming back so late.C. He only earned a quarter and a dime that day.D. He was ashamed the plant had no flowers on it.6. Which word can replace the underlined word “contagious” in the passage?A. Difficult.B. Medical.C. Infectious.D. Unstable.7. Which can be the best title for the passage?A. What thirty-five cents can buy.B. A flower to last forever.C. Weed and the most beautiful flower.D. A big and surprising gift.CIt sounds almost too good to be true, but a new study on sleeping brains suggests that listening to languages while you sleep can actually help you to learn them.For the study, researchers played recordings of foreign words and their translations to subjects enjoying slow-wave sleep, a stage when a person has little consciousness of their environment. To ensure that the results were not compromised by foreign language words that subjects may have had some contact with at some point in their waking lives, researchers made up totally non-existent foreign words.When the subjects woke up, they were presented with the made-up words again without their translations. The subjects were then asked to imagine whether this made-up word indicated an object that was either smaller or larger than a shoebox. This vague (模糊的) way of testing their understanding of the words is an approach that is supposed to tap into the unconscious memory.Unbelievably, the subjects were able to correctly classify the word in this way at an accuracy rate that was 10 percent higher than random chance. That’s not a rate high enough to have them suddenly communication in a foreign tongue, but it is enough to suggest that the brain is still absorbing information on some level, even during sleep.Researchers have long known that sleep is important for memory, but previously its role in memory was thought to relate only to the preservation and organization of memories acquired during wakefulness. This is the first time that memory formation has been shown to be active during sleep.In other words, our brains are listening to the world, and learning about it, even when our conscious selves are not present.The next step for researchers will be to see if new information can be learned quicker during wakefulness if it was already presented during sleep. If so, it could forever change how we train our brains to learn new things. Sleep learning mightbecome a widespread practice.8. Why did researchers use some made-up words in the study?A. To guarantee the accuracy of the test result.B. To increase the difficulty of testing information.C. To avoid the subjects cheating in the experiment.D. To test if our brains are good at learning something new.9. What were the subjects asked to do in the study?A. Classify what they heard by size.B. Make up a word to represent “large” or “small”.C. Repeat the words they heard in the sleep.D. Imagine the meanings of the make-up words.10. What conclusion did researchers draw from this study?A. Sleep is necessary for a good memory.B. Memory formation goes on during sleep.C. Listening during sleep is good for our brains.D. Learning languages in sleep has better effects.11. What will be the researcher’s next plan?A. To train people to learn during sleep.B. To prove the existence of unconscious memory.C. To dig out the reason for unconscious learning.D. To study the effect of sleep learning on conscious learning.DOn Delancy Street in Lower Manhattan, an exciting new project is being developed in a Williamsburg Bridge trolley station. Designed by James Ramsey, owner of Raad Studio, and Dan Barasch, the project will transform the abandoned space into a new, futuristic city landmark -- the Lowline.Ramsey planned to use solar technology in the site, creating an environment where plant life could grow underground.Joined to the JMZ Essex subway stop, the park will not only be an entertaining attraction, it will also become a part of passengers’ lives.Much like the High Line built in Manhattan on an elevated(高出地面的)section of abandoned New York Central Railroad in the Lower West Side, the park will combine the natural elements of the park with industrial aspects already available in the city.The solar collecting system in the Lowline will catch sunlight above ground,transfer it underground and distribute it around the park via reflective domes(穹顶).The light enables plants and trees to grow.During periods of sunlight,electricity would not be necessary to light the space. In 2012, the Lowline team exhibited this technology in an abandoned warehouse in the Lower East Side, available for the public and press to view so that proof of its ability could be confirmed.Since then, many city officials have shown their support of the concept and several programs have been conducted to involve youth and young designers into the park’s creation.Though the negotiations of the park creation have not been completed and it will likely not be available for citizens to enjoy until around 2020, the inventive idea will bring a dynamic new attraction to the city. It will not only create a new escape from the industrial noise, but also introduce the concept of parks and plant growth being made possible in the most unlikely places.12. What is the similarity between the High Line and the Lowline?A. Offering convenience only for passengers.B. Planting the same types of plant life.C. Making full advantage of solar technology.D. Turning industrial wasteland into green space.13. Which is true of the future Lowline?A. It’s an exciting trolley station.B. It’s a long﹣term open exhibition.C. It’s a solar﹣powered underground park.D. It’s a city landmark above the ground.14. Why did the Lowline team hold the exhibition?A. To conduct some programs.B. To prove the technology works.C. To win support from volunteers.D. To show the warehouse is useful.15. What’s the author’s attitude towards the concept of the Lowline?A. Optimistic.B. Unconcerned.C. Opposed.D. Doubtful.第二节(共5小题;每小题2分,满分10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。