Question

(x-y)^4·(x-y)-2(y-x)³·（y-x)²怎么算,

Answer 1

(x-y)^4·(x-y)-2(y-x)³·（y-x)²

=(x-y)^4·(x-y)+2(x-y)³·（x-y)²

=(x-y)^5+2(x-y)^5

=3(x-y)^5

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