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