题目内容
先化简,再求值:
-
,其中x=2.
| x3-x2 |
| x2-x |
| 1-x2 |
| x+1 |
原式=
+
=2x-1.
当x=2时:
原式=2x-1=3.
| x2(x-1) |
| x(x-1) |
| (x+1)(x-1) |
| x+1 |
当x=2时:
原式=2x-1=3.
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题目内容
| x3-x2 |
| x2-x |
| 1-x2 |
| x+1 |
| x2(x-1) |
| x(x-1) |
| (x+1)(x-1) |
| x+1 |