化简2XY+(X-Y)²

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化简2XY+(X-Y)²
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化简2XY+(X-Y)²
化简2XY+(X-Y)²

化简2XY+(X-Y)²
完全平方公式(X-Y)²=X²+Y²-2XY
2XY+(X-Y)²
=2XY+X²+Y²-2XY
=X²+Y²

2XY+(X-Y)²
=2XY+X²+Y²-2XY
=X²+Y²

2xy+x2-2xy+y2=x2+y2