内江2020—2021学年度第一学期期末考试初中七年级

内江市2020—2021学年度第一学期期末考试初中七年级

数 学 试 题

本试卷包括第Ⅰ卷（选择题）和第Ⅱ卷（非选择题）两部分。第Ⅰ卷1至2页，第Ⅱ卷3至6页。全卷满分120分，考试时间120分钟。

注意事项：

1、答第Ⅰ卷前，请考生务必将自己姓名、准考证号、考试科目写在试卷相应的位置上。

2、每小题选出答案后，用钢笔把答案标号填写在第Ⅱ卷卷首的选择题答题卡的相应号上，不能答在第Ⅰ卷的试题上。

3、考试结束后，监考人员将第Ⅱ卷收回并按考号顺序装订密封。

一、选择题（本大题共12个小题，每小题4分，共48分。以下每小题都给出了A 、B 、C 、D 四个选项，其中只有一个是符合题目要求的。）

1、2021-的倒数是（ ）

A 、2021

B 、2021-

C 、2021

1-

D 、

2021

1

2、据新华社2020年5月17

日消息，全国各地约42600名医务人员支援湖北抗击新冠肺炎疫情，将42600用科学记数法表示为（

）

A 、510

426.0? B 、

51026.4? C 、4106.42? D 、41026.4?

3、下列各组代数式中，属于同类项的是（ ）

A 、2x 与2xy

B 、23ab 与23ab -

C 、xyz 4-与2222z y x

D 、a 3与b 2

4、如图所示的是一个由5块大小相同的小正方体搭建成的几何体，则它的左视图是（ ）

5、下列说法正确的是（ ）

A 、一个数的前面添上一个“-”，一定是负数

B 、有理数的绝对值一定是正数

C 、互为相反数的两个数的绝对值一定相等

D 、如果一个数的绝对值是它本身，则这个数一定是正数

6、下列图形中，不是正方体表面展开图的是（ ）

正面 A B C D

7、若532=-x y ，则代数式y x 468-+的值是（ ）

A 、2-

B 、0

C 、7

D 、3-

8、《九章算术》中记载一个问题：今有共买物，人出八，盈三；人出七，不足四。问人数、物价各几何？意思是：今有人合伙购物，每人出8钱，会多3钱；每人出7钱，又差4钱。问人数、物价各多少？设人数为x 人，则表示物价的代数式是（ ）

A 、38-x

B 、38+x

C 、47-x

D 、()47+x

9、如图，点A 、O 、E 在同一条直线上，?=∠40AOB ，6228'?=∠EOD ，OD 平分COE ∠，则=∠COB （ ）

A 、6468'?

B 、2382'?

C 、8282'?

D 、6482'?

10、如图是有理数a ，b 在数轴上的位置，下列结论：①0<+b a ；②22b a >；③||||||b a b a +<+；④

1->b

a

，其中正确的有（

） A 、①② B 、①②③ C 、①②④ D 、①②③④

11、如图，如果EF AB //，CD EF //，下列各式正确的是（ ）

A 、?=∠-∠+∠90321

B 、?=∠+∠-∠90321

C 、?=∠+∠+∠90321

D 、?=∠-∠+∠180132

12、如图，每个图案都有若干个“●”组成，其中第①个图案中有7个“●”，第②个图案中有13个“●”，……，则第⑨个图案中“●”的个数为（ ）

A 、87

B 、91

C 、103

D 、111

A B C D

A

第11题图

O 1 2

F E B C

D

3

a

第10题图

b

A

第9题图

O E

B

C D

图② 图③ 图④

图①

内江2020—2021学年度第一学期期末七年级

数 学 试 题

第Ⅱ卷（非选择题 共72分）

注意事项：

1、第Ⅱ卷共4页，用钢笔或圆珠笔将答案直接答在试卷上。

2、答题前将密封线内的项目填写清楚。

二、填空题（本大题共4个小题，每小题4分，共16分。请将最后答案直接填在横线上）

13、单项式4

32b

a π-的系数是 ，次数是 ；

14、如图，直线b a //，直线l 与a ，b 分别相交于A 、B 两点，过点A 作直线l 的垂线交直线b 于点C ，若?=∠651，则2∠的度数为 ；

15、数轴上点M 表示有理数5-，将点M 向右平移3个单位长度到达点N ，点E 到点N 的距离为4，则点E 表示的有理数为 ；

16、如图，在2020个“□”中依次填入一列数字1m ，2m ，3m ，……，2020m ，使得其中任意

三、解答题（本大题6个小题，共56分。解答应写出必要的文字说明或演算步骤。） 17、（本小题满分10分）

（1）计算：()481214361-???

?

??-+-

（2）计算：()()31341212

3

2020----+??

? ?

?-

?-+-

18、（本小题满分8分）

先化简，后求值：()[]

2222224222ab b a ab b a b a -----，其中a ，b 满足012=++-b a

19、（本小题满分8分）

1 l

2 a

b

B

A

C

如图，点C 为线段AB 上一点，点D 为BC 的中点，且12=AB ，CD AC 4=

（1）求AC 的长；

（2）若点E 在直线AB 上，且3=AE ，求DE 的长。

20、（本小题满分9分）

如图，已知CD AB //，D B ∠=∠，AE 交BC 的延长线于点E . （1）求证：BE AD //

（2）若?=∠=∠6021，EAC BAC ∠=∠2，求DCE ∠的度数。

21、（本小题满分9分）

2020年的“新冠肺炎”疫情的蔓延，市场上医用口罩销量大幅增加，某口罩加工厂为满足市场需求，计划每天生产6000个，由于各种原因与实际每天生产量相比有出入，下表是三月份某一周的生产情况（超产为正，减产为负，单位：个）

星期 一 二 三 四 五 六 日 增减

+150

-200

+300

-100

-50

+250

+150

（1）产量最多的一天比产量最少的一天多生产多少个？

E

1 2

D

B

A

C

（2）与原计划产量比较，这一周产量超产或减产多少个？

（3）若口罩加工厂实行计件工资制，每生产一个口罩0.2元，则本周口罩加工厂应支付工人的工资总额是多少元？

22、（本小题满分12分）

小明同学在完成七年级上册数学的学习后，遇到了一些问题，请你帮助他解决一下： （1）如图1，已知CD AB //，则DCE BAE AEC ∠+∠=∠成立吗？请说明理由；

（2）如图2，已知CD AB //，BE 平分ABC ∠，DE 平分ADC ∠，BE 、DE 所在直线交于点E ，若

?=∠60FAD ，?=∠40ABC ，求BED ∠的度数；

（3）将图2中的点B 移到点A 的右侧，得到图3，其他条件不变，若?=∠αFAD ，?=∠βABC ，请你求出BED ∠的度数（用含α，β的式子表示）

图 2

E

A

B

C

D

图 3 E

A

B

C

D

B

图 1

A E

C

D

F

F

初一英语期末考试试题以及答案--人教版

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人教版初一英语期末考试试题以及标准答案

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