2019最新单句改错专练510题数学.ppt
2019数学中考试题选择题专项训练(共三十套)
2019年中考数学选择题专项训练(共三十套)本试题均按照中考要求设计,覆盖中考数学选择题所有题型及考点,难度较中考略难。
每套试题最上方均配备标准答题卡,试题最后配备参考答案。
本试题是选择题专项训练的训练载体,是课程《2019中考数学真题演练(一)分题型训练》第1讲、第2讲的讲义及作业。
1.建议与《2019中考数学真题演练(一)分题型训练》配套使用。
重在对选择题进行中考适应性训练,熟悉中考选择题题型结构,掌握选择题答题的一整套标准动作,确保在中考中飞速拿到满分,顺利找到做题节奏,调整考试状态。
2.三十套题不一定要全部做完,关键是每做一套都按训练要求做,并能认真总结考点,分析自己的问题,积极解决。
针对自己不会的题,务必查找资源查漏补缺,尤其是超过3分钟无思路的题型;对自己会做、却屡次出错的题型务必借助资源找到根本原因,对症解决。
(课本、老师、同学都是您可以利用的资源)3.当考试一样,限时做题,模拟考试场景,提升实战能力。
建议限时7分钟完成所有题目及涂卡,刚开始训练时可以放宽至10分钟。
为更好的模拟中考考场情境,建议您打印使用。
中考数学选择题专项训练课堂配套试题(一)做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 3.ABCD5.ABCD7.ABCD2.ABCD4.ABCD 6.ABCD 8.ABCD一、选择题(每小题3分,共24分)1.下列各组数中,互为相反数的是【】A.2和 2 B.2和12 C.2和12D.12和22.初步核算,2012年全年国内生产总值519 322亿元,按可比价格计算,比上年增长%.请你以亿元为单位用科学记数法表示去年我国的国内生产总值为(结果保留两个有效数字)【】A.×106 B.×1013 C.×105 D.×1053.下列说法:①一组数据不可能有两个众数;②将一组数据中的每一个数据都加上(或都减去)同一个常数后,方差恒不变;③随意翻到一本书的某页,这页的数码是奇数,这个事件是必然发生的;④要反映郑州市某一天内气温的变化情况,宜采用折线统计图.其中正确的是【 】 A .①和③ B .②和④ C .①和② D .③和④4. 把抛物线yx 2bx c 的图象向左平移3个单位,再向下平移2个单位,所得图象的关系式为y =x 23x 5,则有【 】 A .b 3,c 7 B .b9,c 25 C .b 3,c 3 D .b9,c 215. 函数y =1k x-的图象与直线y x 没有交点,那么k 的取值范围是【 】A .k >1B .k <1C .k > 1D .k <16. 如图是一个正六棱柱的主视图和左视图,则图中的a =【 】左视图主视图aa 43A .32B .3C .2D .17. 如图,AD 是△ABC 的角平分线,DF ⊥AB ,垂足为F ,DEDG ,△ADG 和△AED 的面积分别为50和39,则△EDF 的面积为【 】 A .11 B . C .7 D .GF EDC BA第7题图 第8题图8. 如图,两正方形彼此相邻且内接于半圆,若小正方形的面积为16cm 2,则该半圆的半径为【 】A .(45.9cm C .45.62cm中考数学选择题专项训练课堂配套试题(二)做题时间:_______至_______ 家长签字:_____________共__________分钟 日 期:_____月_____日1.ABCD 2.ABCD3.ABCD4.ABCD5.ABCD6.ABCD 7.ABCD 8.ABCD一、选择题(每小题3分,共24分)1. 计算327的结果是【 】A .33±B .33C .3D .32. 如图,a ∥b ,∠165°,∠2140°,则∠3【 】A3. 下列各式运算正确的是【 】A .2a 2·3a 25a 2B .(a 2)3a 6C .3223=55D .2210(0.1)1--⨯=4. 有一人患了流感,经过两轮传染后共有121人患了流感,每轮传染中平a321b均一个人传染了【 】个人A .12B .11C .10D .95. 某农科所对甲、乙两种小麦各选用10块面积相同的试验田进行种植试验,它们的平均亩产量分别是610x =甲千克,608x =乙千克,亩产量的方差分别是229.6S =甲,2 2.7S =乙,则关于两种小麦推广种植的合理决策是【 】A .甲的平均亩产量较高,应推广甲B .甲、乙的平均亩产量相差不多,均可推广C .甲的平均亩产量较高,且亩产量比较稳定,应推广甲D .甲、乙的平均亩产量相差不多,但乙的亩产量比较稳定,应推广乙6. 已知一次函数y 1x 1和反比例函数22y x=的图象在平面直角坐标系中交于A ,B 两点,当y 1>y 2时,x 的取值范围是【 】 A .x >2 B .1<x <0 C .x >2或1<x <0 D .0<x <27. 如图,在方格纸上△DEF 是由△ABC 绕定点P 顺时针旋转得到的.如果用(2,1)表示方格纸上A 点的位置,(1,2)表示FED C BAB 点的位置,那么点P 的位置为【 】A .(5,2)B .(2,5)C .(2,1)D .(1,2)8. 如图,在正方形ABCD 中,AB3cm ,动点M 自A 点出发沿AB 方向以每秒1cm 的速度运动,同时动点N 自A 点出发沿折线AD DC CB 以每秒3cm 的速度运动,到达B 点时运动同时停止,设△AMN 的面积为y (cm 2).运动时间为x (秒),则下列图象中能大致反映y 与x 之间函数关系的是【 】M ND CBAA. B.C. D.中考数学选择题专项训练课堂配套试题(三)做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 3.ABCD5.ABCD7.ABCD2.ABCD4.ABCD 6.ABCD 8.ABCD一、选择题(每小题3分,共24分)1.3×(4)的值是【】A.12 B.7 C. 1 D.122.若一个所有棱长都相等的三棱柱,它的主视图和俯视图分别是正方形和正三角形,则左视图是【】A.矩形 B.正方形 C.菱形 D.正三角形3.某种鲸的体重约为×105kg,关于这个近似数,下列说法正确的是【】A.精确到百分位,有3个有效数字B .精确到个位,有6个有效数字C .精确到千位,有6个有效数字D .精确到千位,有3个有效数字4. 如图,在等腰梯形ABCD 中,AD ∥BC ,对角线AC ,BD 相交于点O ,下列结论不一定正确.....的是【 】 A .AC BD B .∠OBC ∠OCB C .S △AOBS △CODD .∠BCD ∠BDC5. 某校九年级有17名同学参加百米竞赛,预赛成绩各不相同,要取前9名参加决赛,小梅已经知道了自己的成绩,她想知道自己能否进入决赛,还需要知道这17名同学成绩的【 】A .中位数B .众数C .平均数D .极差6. 如图,O 为原点,点A 的坐标为(3,0),点B 的坐标为(0,4),⊙D 过A ,B ,O 三点,点C 为弧ABO 上的一点(不与O ,A两点重合),则cos ∠C 的值是【 】OB CDAOx yCD ABA .34B .35C .43D .457. 如图,D 是△ABC 内一点,BD ⊥CD ,AD6,BD 4,CD 3,E ,F ,G ,H分别是AB ,AC ,CD ,BD 的中点,则四边形EFGH 的周长是【 】A .7B .9C .10D .118. 如图,在△ABC 中,∠ACB90º,AC >BC ,分别以AB ,BC ,CA 为一边向H GFE CDAB△ABC外作正方形ABDE,BCMN,CAFG,连接EF,GM,ND,设△AEF,△CGM,△BND的面积分别为S1,S2,S3,则下列结论正确的是【】A.S 1S 2S3B.S 1S2<S3 C.S 1S3<S2 D.S 2S3<S1S3S2S1M NBA DCEFG中考数学选择题专项训练课堂配套试题(四)做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 2.ABCD3.ABCD4.ABCD5.ABCD6.ABCD 7.ABCD 8.ABCD一、选择题(每小题3分,共24分)1.计算(1)2(1)3的值为【】A. 2 B. 1 C.0 D.22.如图所示是一些大小相同的小正方体组成的几何体的主视图和俯视图,则组成这个几何体的小正方体块数最多是【】俯视图主视图A.8 B.10 C.12 D.153. 某中学九年级一班准备组织参加旅游,班长把全班48名同学对旅游地点的意向绘制成了扇形统计图,其中“想去海洋馆的学生数”的扇形圆心角为60°,则下列说法中正确的是【 】 A .想去海洋馆的学生占全班学生的60% B .想去海洋馆的学生有12人 C .想去海洋馆的学生肯定最多 D .想去海洋馆的学生占全班学生的164. 某游泳池的横截面如图所示,用一水管向池内持续注水,若单位时间内注入的水量保持不变,则在注水过程中,下列图象能反映深水区水深h 与注水时间t 之间关系的是【 】深水区浅水区D .C .B .A .5. 如图,直线l 和双曲线0k y k x=>()交于A ,B 两点,P 是线段AB 上的点(不与A ,B 重合).过点A ,B ,P 分别向x 轴作垂线,垂足分别为C ,D ,E ,连接OA ,OB ,OP .设△AOC 的面积为1S ,△BOD 的面积为2S ,△POE 的面积为3S ,则【 】A .123S S S <<B .123S S S >>C .123S S S =>D .123S S S =<O ly xPEDC BA y=kx -2yxO B A第5题图 第6题图6. 如图,在平面直角坐标系中,线段AB 的端点坐标为A (2,4),B (4,2),直线y =kx 2与线段AB 有交点,则k 的值不可能是【 】 A . 5 B .2 C .2 D .57. 如图,四边形ABCD 中,∠BAD ∠ADC =90°,AB AD22,CD 2,点P 在四边形ABCD 的边上,若P 到BD 的距离为32,则点P 的个数为【 】 A .1 B .2 C .3 D .4DCB第7题图第8题图8.在平面直角坐标系中,我们把横、纵坐标都是整数的点叫做整点,且规定,正方形的内部不包含边界上的点.观察如图所示的中心在原点、一边平行于x轴的正方形:边长为1的正方形内部有1个整点,边长为2的正方形内部有1个整点,边长为3的正方形内部有9个整点,…,则边长为8的正方形内部的整点的个数为【】A.64 B.49 C.36 D.25中考数学选择题专项训练课堂配套随堂测试做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 3.ABCD5.ABCD7.ABCD2.ABCD4.ABCD 6.ABCD 8.ABCD一、选择题(每小题3分,共24分)1.】A.3 B.3±C D.2.下列命题中,真命题是【】A.对角线互相垂直且相等的四边形是正方形B.等腰梯形既是轴对称图形又是中心对称图形C.圆的切线垂直于经过切点的半径D.垂直于同一直线的两条直线互相垂直3.将一张平行四边形的纸片折一次,使得折痕平分这个平行四边形的面积.则这样的折纸方法共有【 】A .1种B .2种C .4种D .无数种4. 某公司共有51名员工(包括经理),经理的工资高于其他员工的工资.今年经理的工资从去年的200 000元增加到225 000元,而其他员工的工资同去年一样,这样,这家公司所有员工今年工资的平均数和中位数与去年相比将会【 】A .平均数和中位数都不变B .平均数增加,中位数不变C .平均数不变,中位数增加D .平均数和中位数都增加5. 关于x 的方程12mx x -=的解为正实数,则m 的取值范围是【 】A .m ≥2B .m ≤2C .m >2D .m <26. 若等腰三角形一腰上的高等于腰长的一半,则这个等腰三角形的底角为【 】A .75°或15°B .36°或60°C .75°D .30°7. 如图,△ABC 中,A ,B 两个顶点在x 轴的上方,点C 的坐标是(1,0).以点C 为位似中心,在x 轴的下方作△ABC 的位似图形△A ′B ′C ,并把△ABC 的边长放大到原来的2倍.设点B 的对应点A′B′y x11-1-1O CBAB ′的横坐标是a ,则点B 的横坐标是【 】A .12a - B .1(1)2a -+C .1(1)2a --D .1(3)2a -+8. 已知二次函数y ax 2bx c (a ≠0)的图象如图所示,有下列结论:①abc >0;②2a b <0;③a b <m (am b )(m ≠1);④(a c )2<b 2;⑤a >1.其中正确的是【 】A .①⑤B .①②⑤C .②⑤D .①③④2-11O xy中考数学选择题专项训练(一)做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 2.ABCD3.ABCD4.ABCD5.ABCD6.ABCD 7.ABCD 8.ABCD一、选择题(每小题3分,共24分)2.下列几何体各自的三视图中,只有两个视图相同的是【】①正方体②圆锥体③球体④圆柱体A.①③ B.②③ C.③④ D.②④3.学校商店在一段时间内销售了四种饮料共100瓶,各种饮料的销售量如下表:建议学校商店进货数量最多的品牌是【】A.甲品牌 B.乙品牌 C.丙品牌 D.丁品牌A.逐渐增大 B.逐渐减小 C.不变 D.先增大后减小5.如图,在四边形ABCD中,E是BC边的中点,连接DE并延长,交AB的延长线于点F,AB=BF.添加一个条件,使四边形ABCD是平行四边形.你认为下面四个条件中可选择的是【】A.AD=BC B.CD=BF C.∠A=∠C D.∠F=∠CDE6.已知函数y=(k-3)x2+2x+1的图象与x轴有交点,则k的取值范围是【】A.k<4 B.k≤4 C.k<4且k≠3 D.k≤4且k≠38.如图,一种电子游戏,电子屏幕上有一正六边形ABCDEF,点P沿直线AB从右向左移动,当出现点P与正六边形六个顶点中的至少两个顶点距离相等时,就会发出警报,则直线AB上会发出警报的点P有【】A.3个 B.4个 C.5个 D.6个中考数学选择题专项训练(二)做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 3.ABCD5.ABCD7.ABCD2.ABCD4.ABCD 6.ABCD 8.ABCD一、选择题(每小题3分,共24分)1.计算:12=【】A . 1 B.1 C . 3 D.32.如图,把一个长方形纸片沿EF折叠后,点D,C分别落在D′,C′的位置,若∠EFB65°,则∠AED′等于【】A.50°B.55°65°D'C'FE DC BAC.60°D.65°3.已知一组数据:2,1,x,7,3,5,3,2的众数是2,则这组数据的中位数是【】A.2 B.C.3 D.54.下列计算正确的是【】A.336+=B.330-=C.336⋅=D.23-()35.一个几何体的三视图如下图所示,其中主视图和左视图都是腰长为4,底边为2的等腰三角形,则这个几何体侧面展开图的面积为【】A.2πB.12πC.4π2424主视图左视图俯视图D .8π6. 直线l 1:yk 1x b 与直线l 2:y k 2x c 在同一平面直角坐标系中的图象如图所示,则关于x 的不等式k 1x b <k 2x c 的解集为【 】 A .x >1 B .x <1 C .x > 2 D .x <27. 如图,在平面直角坐标系中,正方形ABCO 的顶点A ,C 分别在y 轴,x轴上,以AB 为弦的⊙M 与x 轴相切.若点A的坐标为(0,8),则圆心M 的坐标为-21y =k 2x +cO xy =k 1x +by MBC OxAy【】A.(4,5)B.(5,4)C.(5,4)D.(4,5)8.已知二次函数y ax2bx c同时满足下列条件:对称轴是直线x1;最值是15;二次函数的图象与x轴有两个交点,其横坐标的平方和为15a.则b 的值是【】A. 2 B.2或15 C.4 D.4或30中考数学选择题专项训练(三)做题时间:_______至_______ 家长签字:_____________共__________分钟 日 期:_____月_____日1.ABCD 2.ABCD3.ABCD4.ABCD5.ABCD6.ABCD 7.ABCD 8.ABCD一、选择题(每小题3分,共24分)1. 一个实数a 的相反数是5,则a 等于【 】A .15B .5C .15D .-52. 如图,在数轴上表示实数14的点可能是【 】QP N M 54321A .点MB .点NC .点PD .点Q3. 在平面直角坐标系中,若点P (m -3,m1)在第二象限,则m 的取值范围为【】A.-1<m<3 B.m>3 C.m<-1 D.m>-14.如图,△ABC是等腰三角形,点D是底边BC上异于BC中点的一个点,∠ADE=∠DAC,DE=AC.运用这个图(不添加辅助线)可以说明下列哪一个命题是假命题【】A.一组对边平行,另一组对边相等的四边形是平行四边形B.有一组对边平行的四边形是梯形C.一组对边相等,一组对角相等的四边形是平行四边形D.对角线相等的四边形是矩形EA·OCDB第4题图第5题图5.如图,该图形绕点O按下列角度旋转后,不能与其自身重合的是【】A.72°B.108°C.144°D.216°6. 如图,函数y =-x 2+bx +c 的部分图象与x 轴、y 轴的交点分别为A (1,0),B (0,3),对称轴是直线x =-1,则下列结论中错误的是【 】A .顶点坐标为(-1,4)B .函数的解析式为y =-x 2-2x +3C .当x <0时,y 随x 的增大而增大D .抛物线与x 轴的另一个交点是(-3,0)7. 如图,在△ABC 中,∠C =90°,将△ABC 沿直线MN 翻折后,顶点C 恰好落在AB 边上的点D 处,已知MN ∥AB ,MC =6,NC=MABN 的面积是【 】BDAN MC8. 如图,O 是正方形ABCD 的对角线BD 上一点,⊙O 与边AB ,BC 都相切,点E ,F 分别在AD ,DC 上,现将△DEF 沿着EF 对折,折痕EF 与⊙O 相切,此时点D 恰好落在圆心O 处.若DE =2,则正方形ABCD 的边长是【 】A .3 B .4 C.2 D .FOCBDE A中考数学选择题专项训练(四)做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 3.ABCD5.ABCD7.ABCD2.ABCD4.ABCD 6.ABCD 8.ABCD一、选择题(每小题3分,共24分)1.16的平方根是【】A.8 B.4 C. 4 D.22.有四包真空小包装火腿,每包以标准克数(450克)为基准,超过的克数记作正数,不足的克数记作负数,以下数据是记录结果,其中表示实际克数最接近标准克数的是【】A. 2 B. 3 C. 3 D.4 3.如图是某几何体的三视图及相关数据,则判断正确的是【】俯视图左视图主视图2a bcA .a >cB .b >cC .4a 2+b 2=c 2D .a 2+b 2=c 24. 100名学生进行20秒钟跳绳测试,测试成绩统计如下表:跳绳个数x20<x ≤3030<x ≤4040<x ≤5050<x ≤6060<x ≤70x >70人数 5 2 13 31 23 26则这次测试成绩的中位数m 满足【 】A .40<m ≤50B .50<m ≤60C .60<m ≤70D .m >705. 如图,一次函数y 1=kx +n (k ≠0)与二次函数y 2=ax 2+bx +c (a ≠0)的图象相交于A (1,5),B (9,2)两点,则关于x 的不等式kx +n ≥ax 2+bx +c 的解集为【 】A .1≤x ≤9B .1≤x <95)2)B (9,A (-1,OyxC .1<x≤9 D.x ≤1或x≥96.如图,Rt△ABC中,∠ACB90º,AC BC22,若把Rt △ABC绕边AB 所在的直线旋转一周,则所得几何体的表面积为【】A.4πB.42πC.8πD.82πACBGEFDBC A第6题图第7题图7.如图,在平行四边形ABCD中,E为AB的中点,F为AD上一点,EF交AC于G,AF2cm,DF4cm,AG3cm,则AC的长为【】A.9cm B.14cm C.15cm D.18cm两点,点C(0,n)是y轴正半轴上一点.把坐标平面沿直线AC折叠,若点B刚好落在x轴上,则点C的坐标是【】A.(0,34) B.(0,43) C.(0,3) D.(0,4)中考数学选择题专项训练(五)做题时间:_______至_______ 家长签字:_____________共__________分钟 日 期:_____月_____日1.ABCD 2.ABCD3.ABCD4.ABCD5.ABCD6.ABCD 7.ABCD 8.ABCD一、选择题(每小题3分,共24分)1. 如图所示,将数轴上-2和-1之间的部分用小隔线分成八等份,则图中A点表示的数是【 】-3 -2 A -1 0 1A .54- B .74- C .94- D .114-2. 若点A (n ,2)与B (-3,m )关于原点对称,则n -m 等于【 】A . 1B . 5C .1D .53. 如图,将正方体的相邻两个面各划分成九个全等的小正方形,并分别标上“○”、“×”两符号.若下列有一图形为此正方体的展开图,则此图为【 】DCBAA .B .C .D .4. 如图所示,直线l 表示地图上的一条直线型公路,其中A ,B 两点分别表示公路上第140公里处及第157公里处.若将直尺放在此地图上,使得刻度15,18的位置分别对准A ,B 两点,则此时刻度0的位置对准地图上公路的第几公里处【 】A .17B .55C .72D .85lB A 第157公里第140公里5. 如图所示,将正五边形ABCDE 的C 点固定,并按顺时针方向旋转,则旋转多少度,可使得新五边形A ′B ′CD ′E ′的顶点D ′落在直线BC 上【 】6. 如图,直线y =kx +b 交坐标轴于A (-3,0),B (0,5)两点,则不等式-kx -b <0的解集为【 】A .x >-3B .x <-3C .x >3D .x <37. 如图,已知矩形纸片ABCD ,点E 是AB 的中点,点G 是BC 上的一点,∠BEG >60°.现沿直线EG 将纸片折叠,使点B 落在纸片上的点H 处,连接AH ,则与∠BEG 相等的角的个数为【 】A .5B .3C .2D .18. 如图所示,△ABC 中,∠B =90°,AB =21,BC =20.若有一半径为10的圆分别与AB ,BC 相切,则下列何种方法可找到此圆的圆心【 】CGDHBE A中考数学选择题专项训练(六)做题时间:_______至_______ 家长签字:_____________共__________分钟日期:_____月_____日1.ABCD 3.ABCD5.ABCD7.ABCD2.ABCD4.ABCD 6.ABCD 8.ABCD一、选择题(每小题3分,共24分)1.A为数轴上表示1的点,将A点沿数轴向左移动2个单位长度到B点,则B点所表示的数为【】A. 3 B.3 C.1 D.1或32.有一个铁制零件(正方体中间挖去一个圆柱形孔)如图放置,它的左视图是【】A .B .C .D .3. 在校运动会上,三位同学用绳子将四根同样大小的接力棒分别按横截面如图1,图2,图3所示的方式进行捆绑,三个图中的四个圆心的连线(虚线)分别构成菱形、正方形、菱形,如果把三种方式所用绳子的长度分别用x ,y ,z 来表示,则【 】图3图2图1A .x <y <zB .x =y <zC .x >y >zD .x =y =z4. 已知一元二次方程230x bx +-=的一根为3,在二次函数23y x bx =+-的图象上有三点145,y ⎛⎫- ⎪⎝⎭,254,y ⎛⎫- ⎪⎝⎭,316,y ⎛⎫ ⎪⎝⎭,1y ,2y ,3y 的大小关系是【 】 A .123y y y << B .213y y y <<C .312y y y <<D .132y y y <<5.如图所示,在△ABC中,AB=AC,M,N分别是AB,AC的中点,D,E为BC上的点,连接DN,EM,若AB=5cm,BC=8cm,DE=4cm,则图中阴影部分的面积为【】A.1cm2B.C.2cm2D.3cm26.已知整数x满足-5≤x≤5,y1=x+1,y2=-2x+4,对任意一个x,m都取y1,y2中的较小值,则m的最大值是【】A.1 B.2 C.24 D.97.如图,在梯形ABCD中,AB∥DC,∠D=90°,AD=DC=4,AB=1,F为AD的中点,则点F到BC的距离是【】A.2 B.4 C.8 D.1FBO NMED C BA。
单句改错中考复习单句改错专练
单句改错1.You need not to go with me unless you are free now.2.He promised to come and see us after the supper.3.The teacher is busy preparing for his lesson.4.We got on the school bus and which took us straight to the People’s Park. 5.OliverTwist,the hero of the story, he was an orphan.6.Do you know our team leader we call him Big Wang?7.He told me that how important it is to learn English.8.She asked me if I had found out my new pen.9.I didn’t hear you.Please repeat the sentence again.10.We must study hard in order to serve for the people better in the future.11.Don’t let the children who are so young to go swimming.12.Do you know what do these words mean?13.In fact,they are planning to visit China in next week.14.I have three letters to be answer this afternoon.15.Having been ill for a long time,so she fell behind her classmates.16.What a terrible weather we’ve been having!17.A hundred of people attended the meeting last night.18. “You’ll be late for school unless you will get up at five.”said mother.19.I’ve heard him but I never know him.20.From what I have seen and heard,I must say Chinese people are living happily.21.Would you bought the dictionary if you had had more money yesterday?22.I shall lend the novel to who comes first.23.Would you be kind as to turn off the TV set?24.Do you know anything about the accident happened in the willage yesterday?25.My father has two brothers and three of them are all Party members.26.American English has changed the centuries.27.The recorder needs be repaired before it can be used.28.The book which bought for me by my father cost a lot of money.29.You must do everything you can help others.30.The old man asked a policeman, “Could you show me how get to the post office?”31.The teacher found a cup broken and tried to find who had broken it.32.Jack regretted not go to the meeting last week.33.China is larger than any country in Asia.34.The composition is well written except a few spelling mistakes.35.She married the man because what he had done for her.36.Thanks the teacher’s help,I have made great progress in my English study.37.I have the same idea as his.38.Everyone of us is working hard in this factory.39.I have caught the bad cold for a week and I can’t get rid of it.40.This is the steel plant where we visited last week.41.Following the road and you will find the store.42.This is all what Dr.Smith said at the meeting.43.Everyone agreed to his suggestion which we should hold a meeting to talk aboutthe problem.44.Why don’t you ask anybody else to help you?45.The pen is missing ,for we can’t find it everywhere.46.Sorry,I have no such a book.47.The two languages are not at all the same in neither spelling or grammer.48.Can’t you remember tell me that the other day?49.He had changed so much that I could hardly know him.50.I knew from Joan that Mary had fallen ill.51.Would you please speak something about your family?52.The discovery is great importance in science.53.The experiment was much more easier than we had expected.54.The writing of the report spent me two evenings.55.If I had time,I shall see the new film.56.It took place in France, an European country.57.That is known to all,Taiwan belongs to China.58. “Do you ming getting me some water?”“Certainly don’t.”59.Was it him who telephoned yesterday?60.He is by far the clever student in our class.61.I came here especially to ask you for advice.62.I don’t doubt whether I’m able to finish the work on time.63.The little girl hurried home with the remained money.64.Speak slowly and try to make yourself understand.65.The population of Zheng zhou is fewer than that of Beijing.66.He is so a great man that we all show our respect to him.67.As technology develop, more and more people use the Internet to communicatewith each other.68.Each boy and each girl were given a chance to compete in the game.69.When he was in the twenties, he went to America for his further study.70.Mary mustn’t be in the library , for she went to the hospital with her mother just now.71.The teacher repeated his question again,but I couldn’t answer it.72.His grandpa died three years before.73.The doctors did all what they could to save the soldier.74.Great changes have been taken place in my hometown in the past ten years.75.Austria, an European country , is famous for its music.76.The flowers in the field smell sweetly.77.When he was a child, he was used to walk his grandpa’s dog in the woods nearby.78.I’ll let you know more about the trip as soon as I will work out the plan.79.When I was in trouble, he was always the first offer help.80.You are sure to have a wonderful time in the party.81.The museun was built in the memory of the famous artist.82.Only in this way you be able to solve the problem.83.What will happen if you don’t have balanced diet.84.Have you heard the news which the price of gas will rise?85.It' a pity that the man standing over there is heavy in debt.86.I think it is wrong for you to stare at others.87.We’ll remember the year2008 when saw the great success of the Olympics.88.Hardly had he sat down than the film began.89.Seeing from the spaceship,the earth is a huge water globe.90.This medical team is made up of five men doctors and ten woman nurses.91.The story of his success was so inspired that we were all determined to work harder to achieve our goals.92.Once publishing , the book will become a best seller.93.Although he failed again, he would not lose his heart.94.He knows almost everything about that village because he brought up there.95.When the teacher came in , she found two of the windows breaking.96.We’ll never forget the days when we spend on the beach.97.Our teachers always tell us to believe in which we do and who we are if we want to succeed.98.It mustn’t have rained just now , for the ground is dry.99.The little boy is too young to dress him, so his mother has to help him every day.100.The new school is now three times as bigger as the old one.101.In a rainy night, he came back home alone.102.The traffic accident was happened at the corner of the streets.103.Many years before, there was a beautiful river around the village.104.The girl became very frightening at the sudden noise.105.This is the tallest building which I have ever seen.106.It’s very cold outside.You’d better to put on more clothes.107.It is necessary of you to work hard at English.108.She did all what she could to help him.109.He made so rapid progress that he was praised by all.110.It’s reported that it is 100 years since Qinghua University were founded.111.I’m sorry.I know only a few English.112.As the result, they saved 90% of the trees in the forest.113.She plays piano every day.114.When his best friend left him ,he felt alone.115.His father has never been to Europe.He hasn’t been there, too.116.If you will study hard, you will pass the exam.117.I’ll send my best friend Jane help you.118.When my cousin joins in the Navy,I can use his room.119.His story inspired to me to join in activities.120.They are very active but make many new friends.答案:1。
2019版【人教A版】高中数学:必修1课本例题习题改编(含答案)
2019版数学精品资料(人教版) 人教A 版必修1课本例题习题改编1.原题(必修1第七页练习第三题(3))判断下列两个集合之间的关系:A={}{}|410|20,x x x N B x x m m N ++Î==Î是与的公倍数,,改编 已知集合4x x M x N N **ìü=ÎÎíýîþ且10,集合40x N x Z ìü=Îíýîþ,则(,则() A .M N = B .N M Í C .20x MN x Z ìü=ÎíýîþD .40x M N x N *ìü=Îíýîþ解:{}20,M x x k k N *==Î,{}40,N x x k k Z ==Î,故选D . 2.原题(必修1第十二页习题1.1B 组第一题)已知集合A={1,2},集合B 满足A ∪B={1,2},则这样的集合B 有 个.改编1 已知集合A 、B 满足A ∪B={1,2},则满足条件的集合A 、B 有多少对?请一一写出来. 解:∵A ∪B={1,2},∴集合A ,B 可以是:∅,{1,2};{1},{1,2};{1},{2};{2},{1,2};{2},{1};{1,2},{1,2};{1,2},{1};{1,2},{2};{1,2},∅.则满足条件的集合A 、B 有9对. 改编2 已知集合已知集合A 有n 个元素,则集合A 的子集个数有的子集个数有 个,真子集个数有个,真子集个数有 个 解:子集个数有2n个,真子集个数有21n-个 改编3 满足条件满足条件{}{}1,21,2,3A =的所有集合A 的个数是的个数是个 解:解:33必须在集合A 里面,A 的个数相当于2元素集合的子集个数,所以有4个.3.原题(必修1第十三页阅读与思考“集合中元素的个数”)改编 用C(A)表示非空集合A 中的元素个数,数,定义定义îíì<-³-=*C(B)C(A)当C(A),C(B)C(B)C(A)当C(B),C(A)B A ,若{}{}02)ax ax)(x (x x B ,1,2A 22=+++==,且1B A =*,则由实数a 的所有可能取值构成的集合S =解:由{}2C(A)1,2A ==得,而1B A =*,故3C(B)1C(B)==或.由02)ax ax)(x (x 22=+++得02)ax (x 0ax)(x 22=++=+或.当1C(B)=时,方程02)ax ax)(x (x 22=+++只有实根0x =,这时0a =.当3C(B)=时,必有0a ¹,这时0a x )(x 2=+有两个不相等的实根a x 0,x 21-==,方程02)ax (x 2=++必有两个相等的实根,且异于a x 0,x 21-==,有0,8a Δ2=-=∴22a ±=,可验证均满足题意,∴{}22,0,22-=S .4.原题(必修1第二十三页练习第二题)改编1 小明骑车上学,开始时匀速行驶,途中因交通堵塞停留了一段时间,后为了赶时间加快速度行驶. 与以上事件吻合得最好的图象是与以上事件吻合得最好的图象是解:先分析小明的运动规律,再结合图象作出判断.距学校的距离应逐渐减小,由于小明先是匀速运动,故前段是直线段,途中停留时距离不变,后段加速,后段比前段下降得快,故前段是直线段,途中停留时距离不变,后段加速,后段比前段下降得快,答案选C . 改编2 汽车经过启动、加速行驶、匀速行驶、减速行驶之后停车,若把这一过程中汽车的行驶路程s 看作时间t 的函数,其图象可能是的函数,其图象可能是 () 解:汽车加速行驶时,速度变化越来越快,而汽车匀速行驶时,速度保持不变,体现在s 与t 的函数图象上是一条直线,减速行驶时,速度变化越来越慢,但路程仍是增加的.答案:A .5.原题(必修1第二十四页习题1.2A 组第七题)画出下列函数的图象:(1)F(x)=改编 设函数D(x)= 则下列结论错误的是( )A .D(x)的值域为{0,1}B . D(x)是偶函数是偶函数C .D(x)不是周期函数不是周期函数D .D(x)不是单调函数不是单调函数解:由已知条件可知,D(x)的值域是{0,1},{0,1},选项选项A 正确;当x 是有理数时,-x 也是有理数,且D(-x)=1,D(x)=1,D(-x)=1,D(x)=1,故故D(-x)=D(x),D(-x)=D(x),当当x 是无理数时是无理数时,-x ,-x 也是无理数也是无理数,,且D(-x)=0,D(x)=0,D(-x)=0,D(x)=0,即即D(-x)=D(x),故D(x)D(x)是偶函数是偶函数是偶函数,,选项B 正确正确;;当x 是有理数时是有理数时,,对于任一非零有理数a,x+a 是有理数是有理数,,且D(x+a)=1=D(x),1,x 0,x ìíî为有理数,为无理数,0,x 01,x>0;£ìíî,当x 是无理数时是无理数时,,对于任一非零有理数b,x+b 是无理数是无理数,,所以D(x+b) =D(x)=0,故D(x)D(x)是周期函数是周期函数是周期函数,,(但不存在最小正周期),选项C 不正确不正确;;由实数的连续性易知由实数的连续性易知,,不存在区间I,I,使使D(x)D(x)在区间在区间I 上是增函数或减函数,故D(x)不是单调函数,选项D 正确. 答案:C . 6.原题(必修1第二十四页习题1.2A 组第十题)改编 已知集合{}{}1,2,3,1,2,3,4A B ==.定义映射:f A B ®,则满足点(1,(1)),(2,(2)),(3,(3))A f B f C f 构成ABC D 且=AB BC 的映射的个数为. 解:从A 到B 的映射有3464=个,而其中要满足条件的映射必须使得点A 、B 、C 不共线且=AB BC ,结合图形可以分析得到满足(3)(1)(2)f f f =¹即可,则满足条件的映射有114312m C C =×=个.个.7.原题(必修1第二十五页习题 1.2B 组第二题)画出定义域为{}38,5x x x -££¹且,值域为{}12,0y y y -££¹的一个函数的图像,(1)将你的图像和其他同学的比较,有什么差别吗?(2)如果平面直角坐标系中点P (x,y x,y))的坐标满足38x -££,12y -££,那么其中哪些点不能在图像上?上?改编 若函数()y f x =的定义域为{}38,5x x x -££¹,值域为{}12,0y y y -££¹,则()y f x =的图象可能是(的图象可能是()ABCD 解:根据函数的概念,任意一个x 只能有唯一的y 值和它对应,故排除C ;由定义域为{}38,5x x x -££¹排除A 、D,选B.8.原题(必修1第二十五页习题1.2B 组第三题)函数[x]f(x)=的函数值表示不超过x 的最大整数,例如,4]5.3[-=-;2]1.2[=;当(]35.2, -Îx 时,写出函数f(x)的解析式,并作出函数的图象. 改编1 对于任意实数x ,符号[x]表示x 的整数部分,即[x]是不超过x 的最大整数,例如2[2]=;2]1.2[=;3]2.2[-=-.函数[x]y =叫做“取整函数”,它在数学本身和生产实践中有广泛的应用,则]26[log ]3[log ]2[log ]1[log 3333++++ 的值为的值为 . 解:由题意得,∵130=, 31=3,92=3,2733=.∴原式中共有2个0,6个1,18个2,故原式=422181602=´+´+´.改编2 已知函数f (x )=x -[x ], 其中[x ]表示不超过实数x 的最大整数的最大整数. . 若关于x 的方程f (x )=kx +k 有三个不同的实根个不同的实根, , 则实数k 的取值范围是.111111111111A.[1,)(,]B.(1,][,)C.[,)(,1]D.(,][,1)243243342342- -È - -È - -È - -È 解:画出f(x)f(x)的图象的图象的图象((如右图如右图), ), 与过定点(-1, 0)的直线y=kx+k=k(x+1) 有三个不同的公共点有三个不同的公共点, ,利用数形结合的办法形结合的办法, ,可求得直线斜率k 的取值范围为111(1,][,)243- -È . 答案:B .改编3 对于任意实数对于任意实数x ,符号[]x 表示x 的整数部分,即[]x 是不超过x 的最大整数.这个函数[]x 叫做“取整函数”,它在数学本身和生产实践中有广泛的应用.那么,做“取整函数”,它在数学本身和生产实践中有广泛的应用.那么,(1)[]2log 1+[]2log 2+[]2log 3+[]2log 4+……+[]2log 1024= (2)设()[][],1,3f x x x x éù=×Îëû,则()f x 的值域为的值域为解:(1)[]2log 1=0,[]2log 2=[]2log 3=1,[]2log 4=[]2log 5=[]2log 6=[]2log 7=2,[]2log 8=[]2log 9=……=[]2log 15=3,[]2log 16=[]2log 17=……=[]2log 31=4,……,……[]2log 512=[]2log 512=……=[]2log 1023=9,[]2log 1024=10,则原式=234912223242++92+10´+´+´+´´,用“错位相减法”可以求出原式的值为8204.(2)[)[]()[)[]()1,21,1;2,2.52,4x x f x x x f x Î==Î==时,时,; [)[]()[]()2.5,32,5;33,9x x f x x x f x Î=====时,时,;故[]1,3x Î时()f x 的值域为{}1,4,5,9答案:(1)8204; (2){}1,4,5,9.改编4 函数()[][]2,2f x x x x éù=Î-ëû,的值域为的值域为 .. 解:当[)2,1x Î--时,[]2x =-,(]()[]22,4,2{2,3,4}x f x x -Î=-Î;当[)1,0x Î-时,[]1x =-,(]()[]0,1,{01}x f x x -Î=-Î,;当[)0,1x Î时,[]0x =,()0f x =;当[)1,2x Î时,[]1x =,()[]=1f x x =;当=2x 时,()[]4=4f x =;∴值域为{0,12,3,4},.答案:{0,12,3,4},.9.原题(必修1第三十六页练习第1题(3))判断下列函数的奇偶性:x1x f(x)2+=.改编 关于函数0)(x x1x lgf(x)2¹+=,有下列命题:①其图象关于y 轴对称;②当0x >时,f(x)是增函数;当0x <时,f(x)是减函数;③f(x)的最小值是lg2;④f(x)在区间),2(),0,1(+¥-上是增函数;⑤f(x)无最大值,也无最小值.其中所有正确结论的序号是无最大值,也无最小值.其中所有正确结论的序号是. 解: 0)(x x1x lgf(x)2¹+=为偶函数,为偶函数,故①正确;故①正确;故①正确;令令x1x u(x)2+=,则当0x >时,x 1x u(x)+=在)1,0(上递减,在),1[+¥上递增,∴②错误;③④正确;⑤错误.答案:①③④.上递增,∴②错误;③④正确;⑤错误.答案:①③④.10.原题(必修1第三十九页复习参考题B 组第三题)已知函数()f x 是偶函数,而且在(0,)+¥上是减函数,判断()f x 在(,0)-¥上是增函数还是减函数,并证明你的判断上是增函数还是减函数,并证明你的判断..改编 已知定义在[-2, 2]上的偶函数f (x )在区间[0, 2]上是减函数上是减函数, , 若f (1-m )<f (m ), 则实数m 的取值范围是. 解:由偶函数的定义, (1)(|1|)()(||)f m f m f m f m -=-ìí=î,又由f (x )在区间[0, 2]上是减函数, 所以10|||1|2m m m £<- £2Þ -1£<答案:答案:12m -1£<11.原题(必修1第四十四页复习参考题A 组第四题)已知集合A={x|2x =1},集合B={x|ax=1},若B ÍA ,求实数a 的值.改编 已知集合A={x|x-a=0},B={x|ax-1=0},且A∩B=B ,则实数a 等于等于 。
2019届高考数学人教A版理科第一轮复习课件高考大题增分专项5精选ppt版本
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2019最新单句改错专练510题数学.ppt
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