问题
解答题
(1)(2x+y)2-(2x+3y)(2x-3y)
(2)2x3y•(-2xy)+(-2x2y)2.
答案
(1)原式=4x2+4xy+y2-4x2+9y2=4xy+10y2.
(2)原式=-4x4y2+4x4y2
=0.
(1)(2x+y)2-(2x+3y)(2x-3y)
(2)2x3y•(-2xy)+(-2x2y)2.
(1)原式=4x2+4xy+y2-4x2+9y2=4xy+10y2.
(2)原式=-4x4y2+4x4y2
=0.