最新初二下学期数学经典题型优秀名师资料.docx

1、最新初二下学期数学经典题型优秀名师资料初二下学期数学经典题型数据整理典型题 一、选择题:(每小题3分，共30分) 2.实验中学七年级进行了一次数学测验，参考人数共540人，为了了解这次数学测验成绩，下列所抽取的样本中较为合理的是( ) A.抽取前100名同学的数学成绩 B.抽取后100名同学的数学成绩 C.抽取(1)、(2)两班同学的数学成绩 D.抽取各班学号为3号的倍数的同学的数学成绩 4.统计得到的一组数据有80个，其中最大值为141，最小值为50，取组距为10，可以分成( ) A.10组 B.9组 C.8组 D.7组 5.在频数分布直方图中，各小长方形的高等于相应组的( ) A.组距 B

2、.组数 C.频数 D.频率 8.一个扇形统计图中，扇形A、B、C、D的面积之比为2?3?3?4，则最大扇形的圆心角为( ) A.80? B.100? C.120? D.150? 10.某公司的生产量在七个月之内的增长变化情况如图所示，从图上看，下列结论不正确的是( ) A.2,6月生产量增长率逐月减少 B.7月份生产量的增长率开始回升 C.这七个月中，每月生产量不断上涨 D.这七个月中，生产量有上涨有下跌 二、填空题(每题3分，共计30分) 11.要考察的全体对象称为 ，样本中个体的数目称为 . 13.某超市对今年前两个季度每月销售总量进行统计，为了更清楚地看出销售总量的总趋势是上升还是下降，

3、应选用 统计图来描述数据. 14.在一个扇形统计图中，有一个扇形占整个圆的30%，则这个扇形圆心角是 . 15.有一些乒乓球，不知其数量，先取6个作了标记，把它们放回袋中，混合均credit management: clear conditions and requirements for loan extension. (10) recovery and disposal: 1 term in a year (including) within the loan, in addition to the monthly interest payment, due in principal re

4、payment options, you can also select a matching service, equal principal repayment method; 2, Client Manager after receiving and reviewing early repayment of the application shall be submitted to the head of the Marketing Department for review, processing through the examination and approval procedu

5、res of repayment. (11) defined the offence. Third, in case of problems during the implementation process, please contact Head division. Annex: qilu Bank personal loans guaranteed management qilu Bank b o February 1, 11 key words: retail banking guarantee loan management of qilu Banks Office issued o

6、n February 1, 2011 Proofreading: Liu Debao Annex: qilu Bank personal loans guaranteed Management chapter I General provisions article to promote personal loans guaranteed business development, standardized lending practices, according to the Peoples Republic of China on commercial banks and the Chin

7、a Banking Regulatory Commission and other laws and regulations of the interim measures for the administration of personal loans, these measures are formulated. Individual guarantee article II is a natural or legal person units to provide security for the loan, granted 匀后又取了20个，发现含有两个做标记的，可以估计这袋乒乓球有

8、个. 16.已知一组数据都是整数，其中最大值是242，最小数据是198，若 把这组数据分成9个小组，则组距是 . 17.将收集到的40个数据进行整理分组，已知落在某一区间内的频数 是5，则该组的频率是 . 18.某商场为了解本商场的服务质量，随机调查了来本商场 购物的100名顾客，调查的结果如图所示，根据图中给出的 信息可知，这100名顾客中对该商场的服务 质量表示不满意的有 人. 认识概率典型题 1(2012?肇庆)袋子中装有4个黑球2个白球，这些球除了颜色外都相同，从袋子中随机摸出一个球，则摸到黑球的概率是 ( ) 1112 A( B( C( D( 623312(从n张互不相同的普通扑克牌

9、中任意抽取一张，抽到黑桃K的概率为,则n5为:( ) A(54 B(52 C(10 D(5 ,3(从1、l、2三个数中任取一个，作为一次函数y=kx+3的k值，则所得一次函数中y随x的增大而增大的概率是_( 4(有一个正十二面体，12个面上分别写有1,12这12个整数，投掷这个正十二面体一次，向上一面的数字是3的倍数或4的倍数的概率是_( 4(对于平面内任意一个四边形ABCD，现从以下四个关系式:?AB=CD;?AD=BC;?AB?CD;?A=C中任取两个作为条件，能够得出这个四边形，ABCD是平行四边形的概率是_( 平行四边形的性质 二、课中强化(10分钟训练) 1.如图3,在平行四边形AB

10、CD中，下列各式不一定正确的是( ) A.?1+?2=180? B.?2+?3=180? C.?3+?4=180? D.?2+?4=180? credit management: clear conditions and requirements for loan extension. (10) recovery and disposal: 1 term in a year (including) within the loan, in addition to the monthly interest payment, due in principal repayment options, y

11、ou can also select a matching service, equal principal repayment method; 2, Client Manager after receiving and reviewing early repayment of the application shall be submitted to the head of the Marketing Department for review, processing through the examination and approval procedures of repayment.

12、(11) defined the offence. Third, in case of problems during the implementation process, please contact Head division. Annex: qilu Bank personal loans guaranteed management qilu Bank b o February 1, 11 key words: retail banking guarantee loan management of qilu Banks Office issued on February 1, 2011

13、 Proofreading: Liu Debao Annex: qilu Bank personal loans guaranteed Management chapter I General provisions article to promote personal loans guaranteed business development, standardized lending practices, according to the Peoples Republic of China on commercial banks and the China Banking Regulato

14、ry Commission and other laws and regulations of the interim measures for the administration of personal loans, these measures are formulated. Individual guarantee article II is a natural or legal person units to provide security for the loan, granted 图3 图4 图5 2.如图4,ABCD的周长为16 cm，AC、BD相交于点O，OE?AC交AD于

15、E，则?DCE的周长为( ) A.4 cm B.6 cm C.8 cm D.10 cm 3.如图5，ABCD中,EF过对角线的交点O,如果AB=4 cm,AD=3 cm,OF=1 cm,则四边形BCFE的周长为_. 4.如图6,已知在平行四边形ABCD中，AB=4 cm，AD=7 cm，?ABC的平分线交AD于点E，交CD的延长线于点F，则DF=_ cm. 图6 图7 5.如图7,在平行四边形ABCD中，点E、F在对角线BD上，且BE=DF，求证:AE=CF. 6.在ABCD中,AE?BC于E,AF?CD于F,BE=2 cm,DF=3 cm,?EAF=60?,试求CF的长.(自己画图) 三、课

16、后巩固(30分钟训练) 1.ABCD中,?A比?B大20?,则?C的度数为( ) A.60? B.80? C.100? D.120? 2.以A、B、C三点为平行四边形的三个顶点,作形状不同的平行四边形,一共可以作( ) A.0个或3个 B.2个 C.3个 D.4个 3.如图9所示,在ABCD中,对角线AC、BD交于点O,下列式子中一定成立的是( ) A.AC?BD B.OA=OC C.AC=BD D.AO=OD credit management: clear conditions and requirements for loan extension. (10) recovery and d

17、isposal: 1 term in a year (including) within the loan, in addition to the monthly interest payment, due in principal repayment options, you can also select a matching service, equal principal repayment method; 2, Client Manager after receiving and reviewing early repayment of the application shall b

18、e submitted to the head of the Marketing Department for review, processing through the examination and approval procedures of repayment. (11) defined the offence. Third, in case of problems during the implementation process, please contact Head division. Annex: qilu Bank personal loans guaranteed ma

19、nagement qilu Bank b o February 1, 11 key words: retail banking guarantee loan management of qilu Banks Office issued on February 1, 2011 Proofreading: Liu Debao Annex: qilu Bank personal loans guaranteed Management chapter I General provisions article to promote personal loans guaranteed business d

20、evelopment, standardized lending practices, according to the Peoples Republic of China on commercial banks and the China Banking Regulatory Commission and other laws and regulations of the interim measures for the administration of personal loans, these measures are formulated. Individual guarantee

21、article II is a natural or legal person units to provide security for the loan, granted 图9 图10 图11 4.如图10,平行四边形ABCD中，对角线AC、BD相交于点O，将?AOD平移至?BEC的位置，则图中与OA相等的其他线段有( ) A.1条 B.2条 C.3条 D.4条 5.如图11,在平行四边形ABCD中，EF?AB，GH?AD，EF与GH交于点O，则该图中的平行四边形的个数共有( ) A.7个 B.8个 C.9个 D.11个 6.如图12,平行四边形ABCD中，AE?BD，CF?BD，垂足分别

22、为E、F，求证:?BAE=?DCF. 图12 7、如图13所示,已知平行四边形ABCD中,E、F分别是BC和AD上的点,且BE=DF. 求证:?ABE?CDF. 图13 8.如图14,已知四边形ABCD是平行四边形，?BCD的平分线CF交边AB于F，?ADC的平分线DG交边AB于G. (1)求证:AF=GB; (2)请你在已知条件的基础上再添加一个条件，使得?EFG是等腰直角三角形,并说明理由. credit management: clear conditions and requirements for loan extension. (10) recovery and disposal:

23、 1 term in a year (including) within the loan, in addition to the monthly interest payment, due in principal repayment options, you can also select a matching service, equal principal repayment method; 2, Client Manager after receiving and reviewing early repayment of the application shall be submit

24、ted to the head of the Marketing Department for review, processing through the examination and approval procedures of repayment. (11) defined the offence. Third, in case of problems during the implementation process, please contact Head division. Annex: qilu Bank personal loans guaranteed management

25、 qilu Bank b o February 1, 11 key words: retail banking guarantee loan management of qilu Banks Office issued on February 1, 2011 Proofreading: Liu Debao Annex: qilu Bank personal loans guaranteed Management chapter I General provisions article to promote personal loans guaranteed business developme

26、nt, standardized lending practices, according to the Peoples Republic of China on commercial banks and the China Banking Regulatory Commission and other laws and regulations of the interim measures for the administration of personal loans, these measures are formulated. Individual guarantee article

27、II is a natural or legal person units to provide security for the loan, granted 图14 平行四边形的判定 二、课中强化(10分钟训练) 1.如图3,在ABCD中，对角线AC、BD相交于点O,E、F是对角线AC上的两点，当E、F满足下列哪个条件时，四边形DEBF不一定是平行四边形( ) A.AE=CF B.DE=BF C.?ADE=?CBF D.?AED=?CFB 2.如图4,ABDC，DC=EF=10，DE=CF=8，则图中的平行四边形有_，理由分别是_、_. 图4 图5 图6 3.如图5,E、F是平行四边形ABC

28、D对角线BD上的两点，请你添加一个适当的条件:_，使四边形AECF是平行四边形. 4.如图6,AD=BC,要使四边形ABCD是平行四边形,还需补充的一个条件是:_ _. 5.如图,在ABCD中,已知M和N分别是边AB、DC的中点,试说明四边形BMDN也是平行四边形. 1、开展一帮一活动，让优秀学生带动后进生，促使他们的转化。三、课后巩固(30分钟训练) 1.以不在同一直线上的三个点为顶点作平行四边形最多能作( ) A.4个 B.3个 C.2个 D.1个 2.下面给出了四边形ABCD中?A、?B、?C、?D的度数之比，其中能判定四边形ABCD是平行四边形的是( ) A.1?2?3?4 B.2?2

29、?3?3 C.2?3?3?2 D.2?3?2?3 第三章 圆credit management: clear conditions and requirements for loan extension. (10) recovery and disposal: 1 term in a year (including) within the loan, in addition to the monthly interest payment, due in principal repayment options, you can also select a matching service, eq

30、ual principal repayment method; 2, Client Manager after receiving and reviewing early repayment of the application shall be submitted to the head of the Marketing Department for review, processing through the examination and approval procedures of repayment. (11) defined the offence. Third, in case

31、of problems during the implementation process, please contact Head division. Annex: qilu Bank personal loans guaranteed management qilu Bank b o February 1, 11 key words: retail banking guarantee loan management of qilu Banks Office issued on February 1, 2011 Proofreading: Liu Debao Annex: qilu Bank

32、 personal loans guaranteed Management chapter I General provisions article to promote personal loans guaranteed business development, standardized lending practices, according to the Peoples Republic of China on commercial banks and the China Banking Regulatory Commission and other laws and regulations of the interim measures for the