2(x²+y²)(x+y)²-(x²-y²)²
=2(x²+y²)(x+y)²-(x-y)²(x+y)²
=[2(x²+y²)-(x-y)²](x+y)²
=(2x²+2y²-x²+2xy-y²)(x+y)²
=(x²+2xy+y²)(x+y)²
=(x+y)²(x+y)²
=(x+y)^4
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原式=2(x²+y²)(x+y)²-(x+y)²(x-y)²
=(x+y)²(2x²+2y²-x²+2xy-y²)
=(x+y)²(x²+2xy+y²)
=(x+y)²^4
2(x²+y²)(x+y)²-(x²-y²)²
=2(x²+y²)(x+y)²-(x+y)²(x-y)²
=(x+y)²(2(x²+y²)-(x-y)²)
=(x+y)²(2x²+2y²-x²+2xy-y²)
=(x+y)²(x²+2xy+y²)
=(x+y)²(x+y)²
=(x+y)^4
(X+Y)4次方