因式分解 (x-y)²-(x+y)(y-x)
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(x-y)²-(x+y)(y-x)
=(x-y)²-(y+x)(y-x)
=(x-y)²-(y²-x²)
=x²+y²-2xy-y²+x²
=2x²-2xy
=(x-y)²-(y+x)(y-x)
=(x-y)²-(y²-x²)
=x²+y²-2xy-y²+x²
=2x²-2xy
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(x-y)²-(x+y)(y-x)
=(x-y)²+(x+y)(x-y)
=(x-y)(x-y+x+y)
=2x(x-y)
=2x²-2xy
=(x-y)²+(x+y)(x-y)
=(x-y)(x-y+x+y)
=2x(x-y)
=2x²-2xy
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(x-y)²-(x+y)(y-x)
=(x-y)²+(x+y)(x-y)
=(x-y)*(x-y+x+y)
=2*x*(x-y)
=(x-y)²+(x+y)(x-y)
=(x-y)*(x-y+x+y)
=2*x*(x-y)
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