题目内容
先化简(
+
)÷
,然后选取一个你喜欢的x的值代入计算.
| x+1 |
| x-1 |
| 1 |
| x2-2x+1 |
| x |
| x-1 |
(
+
)÷
=
×
=
,(x≠1)
当x=2时,
原式=2.
| x+1 |
| x-1 |
| 1 |
| x2-2x+1 |
| x |
| x-1 |
=
| x2-1+1 |
| (x-1)2 |
| x-1 |
| x |
=
| x |
| x-1 |
当x=2时,
原式=2.
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