题目内容
计算:
-
-
.
| 4 |
| x+2 |
| 3 |
| 2-x |
| 12 |
| x2-4 |
原式=
+
-
=
=
.
| 4 x-8 |
| ( x+2 ) ( x-2 ) |
| 3 x+6 |
| ( x+2 ) ( x-2 ) |
| 12 |
| ( x+2 ) ( x-2 ) |
| 7 x-14 |
| ( x+2 ) ( x-2 ) |
| 7 |
| x+2 |
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