题目内容
已知x=
+1,求
-
的值.
| 3 |
| 2x |
| x2-1 |
| 1 |
| x+1 |
原式=
-
=
,
当x=
+1时,原式=
=
.
| 2x |
| (x+1)(x-1) |
| x-1 |
| (x+1)(x-1) |
| 1 |
| x-1 |
当x=
| 3 |
| 1 | ||
|
| ||
| 3 |
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题目内容
| 3 |
| 2x |
| x2-1 |
| 1 |
| x+1 |
| 2x |
| (x+1)(x-1) |
| x-1 |
| (x+1)(x-1) |
| 1 |
| x-1 |
| 3 |
| 1 | ||
|
| ||
| 3 |