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中考数学基础题强化提高测试 16
总分 75 分 时间 35 分钟
一、选择题:每小题 3 分,共 15 分.每小题给出四个答案,其中只有一个是正确的.
1. 1
2
的倒数为( )
A. 1
2
B.2 C. 2 D. 1
2.下列图案是我国几家银行的标志,其中不是..轴对称图形的是( )
3.数学老师布置 10 道填空题,测验后得到如下统计表:
答对题数 7 8 9 10
人 数 4 20 18 8
根据表中数据可知,全班同学答对的题数所组成的样本的中位数和众数分别是( )
A.8、8 B. 8、9 C.9、9 D.9、8
4.下列函数:① y x ;② 2y x ;③ 1y x
;④ 2y x .当 0x 时,y 随 x 的增大而减小的函数
有( )
A.1 个 B.2 个 C.3 个 D.4 个
5.一个正方体的表面展开图可以是下列图形中的( )
二、填空题:每小题 3 分,共 24 分.
6.计算: 2( )a a .
7.梅州是中国著名侨乡,祖籍在梅州的华侨华人及港澳台同胞超过 360 万人,360 万用科学计数法表示为.
8.如图 1,在 O⊙ 中, 20ACB °,则 AOB _______度.
A. B. C. D.
A. B. C. D.
O C
A
B
图 1 图 2
O
9.如图 2 所示,五角星的顶点是一个正五边形的五个顶点.这个五角星可以由一个基本图形(图中的阴
影部分)绕中心 O 至少经过_______次旋转而得到, 每一次旋转______度.
10.小张和小李去练习射击,第一轮 10 发子弹打完后,两人的成绩如图 3 所示 .根据图中的信息,小张
和小李两人中成绩较稳定的是.
11.已知一元二次方程 22 3 1 0x x 的两根为 1 2x x, ,则 1 2x x ___________.
12.如图 4,把一个长方形纸片沿 EF 折叠后,点 D C、 分别落在 1 1 D C、 的位置.若 65EFB °,则
1AED 等于_______度.
13.如图 5,每一幅图中有若干个大小不同的菱形,第 1 幅图中有 1 个,第 2 幅图中有 3 个,第 3 幅图中
有 5 个,则第 4 幅图中有个,第 n 幅图中共有个.
三、解答下列各题:本题有 5 小题,共 81 分.解答应写出文字说明、推理过程或演算步骤.
14.本题满分 7 分.
如图 6,已知线段 AB ,分别以 A B、 为圆心,大于 1
2 AB
长为半径画弧,两弧相交于点 C、Q,连结 CQ 与 AB 相交于
点 D,连结 AC,BC.那么:
(1)∠ ADC ________度;
(2)当线段 4 60AB ACB , °时, ACD ______度, ABC△ 的面积
等于_________(面积单位).
15.本题满分 7 分.
星期天,小明从家里出发到图书馆去看书,再回到家.他离家
图 3
A E D
CFB
D1
C1
图 4
… …
第 1 幅 第 2 幅 第 3 幅 第 n 幅
图 5
C
BDA
图 6
Q
y(千米)
t(分)
3
12 72O
的距离 y(千米)与时间 t(分钟)的关系如图 7 所示.
根据图象回答下列问题:
(1)小明家离图书馆的距离是____________千米;
(2)小明在图书馆看书的时间为___________小时;
(3)小明去图书馆时的速度是______________千米/小时.
16.本题满分 7 分.
计算:
1
0 1( 3 2) 4cos30 | 12 |3
° .
17.本题满分 7 分.
求不等式组 1 1
8 4 1.
x x
x x
≥ ,
的整数解.
18.本题满分 8 分.
先化简,再求值:
2 2
2
4
4 4 1
x x x xx x x
,其中 3
2x .
参考答案
一、选择题:每小题 3 分,共 15 分.每小题给出四个答案,其中只有一个是正确的.
1.C 2.B 3.D 4.B 5.C
二、填空题:每小题 3 分,共 24 分.
6. a 7. 63.6 10 8.40 9.4(1 分),72(2 分)
10.小张 11. 1
2
12.50 13.7(1 分), 2 1n (2 分)
三、解答下列各题:本题有 10 小题,共 81 分.解答应写出文字说明、推理过程或演算步骤.
14.本题满分 7 分.
(1)90········································································································· 2 分
(2)30········································································································· 4 分
4 3 ············································································································· 7 分
15.本题满分 7 分.
(1)3···········································································································2 分
(2)1···········································································································4 分
(3)15········································································································· 7 分
16.本题满分 7 分.
解:
1
0 1( 3 2) 4cos30 | 12 |3
° .
31 3 4 122
····················································································· 4 分
4 2 3 2 3 ···························································································· 6 分
4 ·············································································································· 7 分
17.本题满分 7 分.
解:由 1 1x x ≥ 得 1x≥ ,···········································································2 分
由 8 4 1x x ,得 3x . ··········································································· 4 分
所以不等式组的解为:1 3x ≤ , ···································································6 分
所以不等式组的整数解为:1,2.······································································7 分
18.本题满分 8 分.
解:
2 2
2
4
4 4 1
x x x xx x x
2
( 2)( 2) ( 1)
( 2) 1
x x x x xx x
···································· 3 分
2 12
x
x
2
2
x
x
·········································································································6 分
当 3
2x 时,原式
32 2 63 22
.······································································ 8 分