题目内容
先化简,再求值:(x+1-
)÷
,其中x=2.
| 3 |
| x-1 |
| x3-4x |
| x2-2x+1 |
原式=
•
=
•
=
(8分)
当x=2时,原式=
=
.(10分)
| (x+1)(x-1)-3 |
| x-1 |
| x2-2x+1 |
| x3-4x |
=
| (x+2)(x-2) |
| x-1 |
| (x-1)2 |
| x(x+2)(x-2) |
=
| x-1 |
| x |
当x=2时,原式=
| 2-1 |
| 2 |
| 1 |
| 2 |
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