题目内容
先化简,再计算(
+
)•
,其中x=
.
| 1 |
| x+1 |
| 1 |
| x-1 |
| x2+2x-3 |
| x2+3x |
| 3 |
原式=
•
=
,
当x=
时,原式=
=
-1.
| 2x |
| (x+1)(x-1) |
| x-1 |
| x |
=
| 2 |
| x+1 |
当x=
| 3 |
| 2 | ||
|
| 3 |
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题目内容
| 1 |
| x+1 |
| 1 |
| x-1 |
| x2+2x-3 |
| x2+3x |
| 3 |
| 2x |
| (x+1)(x-1) |
| x-1 |
| x |
| 2 |
| x+1 |
| 3 |
| 2 | ||
|
| 3 |