题目内容
化简
+
的结果是（ ）
| x2 |
| x-1 |
| 1 |
| 1-x |
A．
| B．x+1 | C．x-1 | D．1-x |
原式=
-
=
=x+1．
故选B
| x2 |
| x-1 |
| 1 |
| x-1 |
=
| (x+1)(x-1) |
| x-1 |
=x+1．
故选B
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题目内容
| x2 |
| x-1 |
| 1 |
| 1-x |
A．
| B．x+1 | C．x-1 | D．1-x |
| x2 |
| x-1 |
| 1 |
| x-1 |
| (x+1)(x-1) |
| x-1 |