问题
解答题
化简:(2x+y)(2x-y)+(x+y)2-2(2x2-xy).
答案
(2x+y)(2x-y)+(x+y)2-2(2x2-xy),
=4x2-y2+x2+2xy+y2-4x2+2xy,
=x2+4xy.
化简:(2x+y)(2x-y)+(x+y)2-2(2x2-xy).
(2x+y)(2x-y)+(x+y)2-2(2x2-xy),
=4x2-y2+x2+2xy+y2-4x2+2xy,
=x2+4xy.