题目内容
化简：3ab-
÷
=______．
| a3b+a2b2 |
| a2+2ab+b2 |
| a2-ab |
| a2-b2 |
3ab-
÷
=3ab-
•
=3ab-ab
=2ab．
| a3b+a2b2 |
| a2+2ab+b2 |
| a2-ab |
| a2-b2 |
=3ab-
| a2b(a+b) |
| (a+b)2 |
| (a+b)(a-b) |
| a(a-b) |
=3ab-ab
=2ab．
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