问题
计算题
计算:
(1)(2xy2)2·(﹣3xy3);
(2)(2x﹣3y)(x+2y)﹣(x+y)2
答案
解:
(1)(2xy2)2·(﹣3xy3),
=4x2y4·(﹣3xy3),
=﹣12x3y7;
(2)(2x﹣3y)(x+2y)﹣(x+y)2,
=2x2+4xy﹣3xy﹣6y2﹣x2﹣2xy﹣y2,
=x2﹣xy﹣7y2
计算:
(1)(2xy2)2·(﹣3xy3);
(2)(2x﹣3y)(x+2y)﹣(x+y)2
解:
(1)(2xy2)2·(﹣3xy3),
=4x2y4·(﹣3xy3),
=﹣12x3y7;
(2)(2x﹣3y)(x+2y)﹣(x+y)2,
=2x2+4xy﹣3xy﹣6y2﹣x2﹣2xy﹣y2,
=x2﹣xy﹣7y2