问题
解答题
(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷2y.
答案
原式=x2-y2+(x2-2xy+y2)-(3x2-xy)
=x2-y2+x2-2xy+y2-3x2+xy
=-x2-xy.
(x+y)(x-y)+(x-y)2-(6x2y-2xy2)÷2y.
原式=x2-y2+(x2-2xy+y2)-(3x2-xy)
=x2-y2+x2-2xy+y2-3x2+xy
=-x2-xy.