题目内容
已知,ab=-1,a+b=2,则式子
+
=______.
| b |
| a |
| a |
| b |
∵ab=-1,a+b=2,
∴
+
=
=
=
=-6.
∴
| b |
| a |
| a |
| b |
| b2+a2 |
| ab |
| (a+b)2-2ab |
| ab |
| 4+2 |
| -1 |
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题目内容
| b |
| a |
| a |
| b |
| b |
| a |
| a |
| b |
| b2+a2 |
| ab |
| (a+b)2-2ab |
| ab |
| 4+2 |
| -1 |