(x-y)^3×(x-y)^2×(y-x)

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(x-y)^3×(x-y)^2×(y-x)
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(x-y)^3×(x-y)^2×(y-x)
(x-y)^3×(x-y)^2×(y-x)

(x-y)^3×(x-y)^2×(y-x)
(x-y)^3×(x-y)^2×(y-x)
=(x-y)^3×(x-y)^2×(-1)(x-y)
=(x-y)【2×3×(-1)】
=-(x-y)^6
过程挺完美的,不枉我做了5年的语文教师.