化简(x+y)²-(x-y)²
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化简(x+y)²-(x-y)²化简(x+y)²-(x-y)²化简(x+y)²-(x-y)²(x+y)²-(x-y)²=(
化简(x+y)²-(x-y)²
化简(x+y)²-(x-y)²
化简(x+y)²-(x-y)²
(x+y)²-(x-y)²
=(x+y+x-y)(x+y-x+y)
=2x(2y)
=4xy
4xy
望采纳
(x+y)²-(x-y)²=4xy