问题
解答题
计算：
|
答案
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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计算：
|
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)