配套习题- 二次根式的化简求值（拔高） -【青果学院】

1/5单选题

难度：

1.若x-y=

，xy=

，则代数式（x-1）（y+1）的值等于（）

A	2
B	2
C	2
D

正确答案：Qg==

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

2/5单选题

难度：

2.若a=

，b=

，则

的值为（）

A	2
B	-2
C
D	2

正确答案：QQ==

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

3/5单选题

难度：

3.已知x-2

，则

A
B
C
D

正确答案：RA==

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

4/5单选题

难度：

4.已知a＞b＞0，a+b=6

，则

的值为（）

A
B	2
C
D

正确答案：QQ==

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

5/5单选题

难度：

5.已知a=1-

，b=

+1，则代数式a²+ab+b²的值为（　　）

A	3
B	-3
C	5
D	-5

正确答案：Qw==

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