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