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=(x+y+x-y)(x+y-x+y)=2x*2y=4xy
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