题目内容
计算:
+
-
.
| 4 |
| x2-4 |
| 2 |
| x+2 |
| 1 |
| x-2 |
原式=
+
-
=
=
=
.
| 4 |
| (x+2)(x-2) |
| 2(x-2) |
| (x+2)(x-2) |
| x+2 |
| (x+2)(x-2) |
=
| 4+2x-4-x-2 |
| (x+2)(x-2) |
=
| x-2 |
| (x+2)(x-2) |
=
| 1 |
| x+2 |
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相关题目
计算:
+
的正确结果是( )
| -4 |
| x2-4 |
| 1 |
| x-2 |
A、
| ||
| B、1-x | ||
| C、1 | ||
| D、-1 |