题目内容
(
)2•
-
÷
| a+b |
| a-b |
| 2a-2b |
| 3a+3b |
| a2 |
| a2-b2 |
| a |
| b |
原式=
×
-
×
=
-
=
=
．
故答案为
．
| (a+b)2 |
| (a-b)2 |
| 2(a-b) |
| 3(a+b) |
| a2 |
| (a+b)(a-b) |
| b |
| a |
=
| 2(a+b) |
| 3(a-b) |
| ab |
| (a+b)(a-b) |
=
| 2(a+b)2-3ab |
| 3(a+b)(a-b) |
=
| 2a2+ab+2b2 |
| 3(a+b)(a-b) |
故答案为
| 2a2+ab+2b2 |
| 3(a+b)(a-b) |
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