(y-x)^2(x-y)+(x-y)^3+2(x-y)^2×(y-x)
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原式=(x-y)²(x-y)+(x-y)³-2(x-y)²(x-y)
=(x-y)³+(x-y)³-2(x-y)³
=2(x-y)³+2(x-y)³
=0
=(x-y)³+(x-y)³-2(x-y)³
=2(x-y)³+2(x-y)³
=0
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(y-x)^2(x-y)+(x-y)^3+2(x-y)^2×(y-x)
=(x-y)^2(x-y)+(x-y)^3+2(x-y)^2×[-(x-y)]
=(x-y)^3+(x-y)^3-2(x-y)^3
=0
=(x-y)^2(x-y)+(x-y)^3+2(x-y)^2×[-(x-y)]
=(x-y)^3+(x-y)^3-2(x-y)^3
=0
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