题目内容
化简：
•
+
．
| 2x2-4x |
| x+2 |
| x2+2x |
| x2-4x+4 |
| 4x |
| 2-x |
原式=
•
-
=
-
=
=2x．
| 2x(x-2) |
| x+2 |
| x(x+2) |
| (x-2)2 |
| 4x |
| x-2 |
| 2x2 |
| x-2 |
| 4x |
| x-2 |
| 2x(x-2) |
| x-2 |
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