问题
填空题
计算:(2x-y)2-(2x-y)(2x+y)=______.
答案
(2x-y)2-(2x-y)(2x+y),
=4x2+y2-4xy-(4x2-y2),
=2y2-4xy,
故答案为:2y2-4xy.
计算:(2x-y)2-(2x-y)(2x+y)=______.
(2x-y)2-(2x-y)(2x+y),
=4x2+y2-4xy-(4x2-y2),
=2y2-4xy,
故答案为:2y2-4xy.