题目内容
计算:(1+x)(
-
)
| x-1 |
| x2+x |
| 1-x |
| x3-x |
原式=(1+x)[
+
](4分)
=
+
(5分)
=1.(6分)
| x-1 |
| x(x+1) |
| x-1 |
| x(x+1)(x-1) |
=
| x-1 |
| x |
| 1 |
| x |
=1.(6分)
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题目内容
| x-1 |
| x2+x |
| 1-x |
| x3-x |
| x-1 |
| x(x+1) |
| x-1 |
| x(x+1)(x-1) |
| x-1 |
| x |
| 1 |
| x |