D. -1 ≤ a ≤ 1 17. 若 = 2 - a ,则
a 的取值范围是
6. 若 x <2,化简 + 3 - x 的正确结果是 (
) 三、解答题(42 分) A.-1 B.1 C.2x-5
D.5-2x 7. 若 有意义,则 m 能取的最小整数值是
(
) A.m=0
B.m=1
C.m=2
D.m=3
18.计算
(1) 3 - + -
(2)(4
- 6 2)÷ 2
8.
= 成立的条件是(
)
A.x≥-1
B.x≤3
C.-1≤x≤3
D.-1<x≤3
9.下列各式
(3)(2 + 5 2)(2 - 5 2)-
( 5 -
2)2
(1) + =
(2) 5 - 2
= 3 (3) 8 + 50 = + = 7
2
(4) 3 + = 6 (- 5)2
x 2
- a 2
0.5
5 12 (a +1)(1- a ) (x - 2)2 3 - x
x + 1 7 x 3a
(a - b )2 225 ⨯ 0.04 2xy 27 3 (a - 2)2 27
6 2
5 5 学校:
班级:
考号
姓名:
… ○ … … … … ○ … … … … 外 … … … … ○ … … … … 装 … … … … ○ … … … … 订 … … … … ○ … … … … 线 … … … … ○ … … …
… ○ … … … … ○ … … … … 内 … … … … ○ … … … … 装 … … … … ○ … … … … 订 … … … … ○ … … … … 线 … … … … ○ … … …
是( )
A.-2b
B.-2a
C.2(b-a)
D.0
1 2 + 1
2 3 - 2
( 3 + 2)( 3 - 2)
3 4 - 3
( 4 + 3)( 4 - 3) 4 3 1
7 + 6
n + 1 + n
(4) 7a - 4a 2
+ 7a
20.阅读下面问题:
=
= - 1 ;
=
= - 2;
= = - .
…… 试求:(1)
的值; (2)
1
(n 为正整数)的值. 19.如图,用一个面积为 x 的正方形和四个相同的长方形拼成一个面积为 8x
的正方形图案,求长方形的周长。
8a 1 8a 2a 1⨯ ( 2 - 1)
( 2 + 1)( 2 - 1)
1
3 + 2 1
4 + 3
装 订 线 内 不 许
答 题
“”
“”
At the end, Xiao Bian gives you a passage. Minand once said, "people who learn to learn are very happy people.". In every wonderful life, learning is an eternal theme. As a professional clerical and teaching position, I understand the importance of continuous learning, "life is diligent, nothing can be gained", only continuous learning can achieve better self. Only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. This document is also edited by my studio professionals, there may be errors in the document, if there are errors, please correct, thank you!