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