问题
解答题
计算:
(1)(-2ab2)2-(3a2b-2ab-1)(2)9(a-b)2-(3a+b)(-b+3a)
答案
(1)原式=4a2b4•(3a2b-2ab-1)=12a4b5-8a3b5-4a2b4;
(2)原式=9a2-18ab+9b2-(9a2-b2)=9a2-18ab+9b2-9a2+b2=8b2-18ab.
计算:
(1)(-2ab2)2-(3a2b-2ab-1)(2)9(a-b)2-(3a+b)(-b+3a)
(1)原式=4a2b4•(3a2b-2ab-1)=12a4b5-8a3b5-4a2b4;
(2)原式=9a2-18ab+9b2-(9a2-b2)=9a2-18ab+9b2-9a2+b2=8b2-18ab.