题目内容
先化简,再求值,已知a=-2
,b=
+1,求
-(
)2+
.
| 2 |
| 2 |
| a2 |
| b |
| b2 | ||
|
∵a=-2
,b=
+1,
∴
-(
)2+
=
-(
)2+
=2
-
-1+
=
.
| 2 |
| 2 |
∴
| a2 |
| b |
| b2 | ||
|
=
(-2
|
|
(
| ||||||
|
=2
| 2 |
| 2 |
7
| ||
| 17 |
=
24
| ||
| 17 |
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