计算:(1)(a2+3)(a-2)-a(a2-2a-2);(2)(-53ab3c)?310a2bc?(-8abc)2;(3)(a+b)(a-b)+
计算:(1)(a2+3)(a-2)-a(a2-2a-2);(2)(-53ab3c)?310a2bc?(-8abc)2;(3)(a+b)(a-b)+(a+b)2-2(a-b...
计算:(1)(a2+3)(a-2)-a(a2-2a-2);(2)(-53ab3c)?310a2bc?(-8abc)2;(3)(a+b)(a-b)+(a+b)2-2(a-b)2;(4)(35a5b3+95a7b4-92a5b5)÷34a5b3.
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(1)(a
2+3)(a-2)-a(a
2-2a-2),
=a
3-2a
2+3a-6-a
3+2a
2+2a,
=5a-6;
(2)(-
ab
3c)?
a
2bc?(-8abc)
2,
=-
a
3b
4c
2?64a
2b
2c
2,
=-32a
5b
6c
4;
(3)(a+b)(a-b)+(a+b)
2-2(a-b)
2,
=a
2-b
2+a
2+2ab+b
2-2a
2+4ab-2b
2,
=6ab-2b
2;
(4)(
a
5b
3+
a
7b
4-
a
5b
5)÷
a
5b
3=
+
a
2b-6b
2.
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