配套习题- 条件二次根式的求值问题 -【青果学院】

1/5单选题

难度：

1.已知x=

，则

的值为（）

A	2
B	2
C
D

正确答案：Qg==

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

2/5单选题

难度：

2.已知xy=

，x-y=

-1，则（x+1）（y-1）的值为（　　）

A	6
B	-4
C	6
D	无法确定

正确答案：Qg==

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

3/5单选题

难度：

3.已知a=

,b=

，则

的值为（）

A	3
B	4
C	5
D	6

正确答案：Qw==

6Kej77ya5Y6f5byPPTxpbWcgd2lkdGg9MTcyIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0E0L0MwL3JCQUNFMU9aS0dxeVB0RE9BQUFETWxYQzdTczkyOC5wbmciPjxicj49PGltZyB3aWR0aD0xNzQgaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvNjgvOTgvckJBQ0ZGT1pLR3J4LWVIRkFBQUN1UUlBZGdRNDYxLnBuZyI+PGJyPj01PGJyPumAiUM8YnI+

4/5单选题

难度：

4.已知：a＝3−

，b＝3+

，，则代数式（3a²-18a+15）（2b²-12b+13）的值是（　　）

A	6
B	24
C	42
D	96

正确答案：QQ==

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

5/5单选题

难度：

5.

已知实数x，y满足x+y=-2a，xy=a（a≥1），则的值为（　　）

A
B	2a
C	a
D	2√`a`

正确答案：RA==

PHA+PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzFCLzY0L3JCQUNGRlBNMUthaVJQbmdBQUFSMW5FbXZUNDMyNS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMUIvNjQvckJBQ0ZGUE0xS2FpUlBuZ0FBQVIxbkVtdlQ0MzI1LnBuZyIgYWx0PSIiIHN0eWxlPSJ3aWR0aDogMjI1cHg7IGhlaWdodDogMjc4cHg7Ij48YnI+PC9wPg==