y(x+y)+(x-y)²-x²-2y²

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y(x+y)+(x-y)²-x²-2y²y(x+y)+(x-y)²-x²-2y²y(x+y)+(x-y)²-x²-2y&

y(x+y)+(x-y)²-x²-2y²
y(x+y)+(x-y)²-x²-2y²

y(x+y)+(x-y)²-x²-2y²
原式=xy+y²+x²-2xy+y²-x²-2y²
=-xy