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