题目内容
先化简,再求值:(1-
)÷
,其中x=2.
| 1 |
| x |
| x2-2x+1 |
| x2-1 |
(1-
)÷
=
•
=
,
当x=2时,原式=
=
.
| 1 |
| x |
| x2-2x+1 |
| x2-1 |
=
| x-1 |
| x |
| (x+1)(x-1) |
| (x-1)2 |
=
| x+1 |
| x |
当x=2时,原式=
| 2+1 |
| 2 |
| 3 |
| 2 |
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