题目内容
计算
+(
-x)的结果是______.
| x-1 |
| x |
| 1 |
| x |
原式=
+
=
=
=
=1-x.
故答案为1-x.
| x-1 |
| x |
| 1-x2 |
| x |
| x-1+1-x2 |
| x |
| x-x2 |
| x |
| x(1-x) |
| x |
故答案为1-x.
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题目内容
| x-1 |
| x |
| 1 |
| x |
| x-1 |
| x |
| 1-x2 |
| x |
| x-1+1-x2 |
| x |
| x-x2 |
| x |
| x(1-x) |
| x |