题目内容
计算：
÷
-
．
| a2-6a+9 |
| 4-b2 |
| 3-a |
| 2+b |
| a2 |
| 3a-9 |
原式=
•
-
=
-
=
=
．
| (a-3)2 |
| -(b+2)(b-2) |
| b+2 |
| -(a-3) |
| a2 |
| 3(a-3) |
=
| a-3 |
| b+2 |
| a2 |
| 3(a-3) |
=
| 3(a-3)2-a2(b+2) |
| 3(b+2)(a-3) |
=
| 3a2-18a+27-a2b-2a2 |
| 3(b+2)(a-3) |
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