题目内容
先化简,再求值:
÷(x-
),其中x=
.
| x2+2x |
| 1+x |
| 2 |
| x+1 |
| 2 |
原式=
÷(
)=
×
=
,
当x=
时,原式=
=2+
.
| x(x+2) |
| x+1 |
| x2+x-2 |
| x+1 |
| x(x+2) |
| x+1 |
| x+1 |
| (x+2)(x-1) |
| x |
| x-1 |
当x=
| 2 |
| ||
|
| 2 |
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