(X减Y)的三次方减X加Y

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(X减Y)的三次方减X加Y

(X减Y)的三次方减X加Y
(X减Y)的三次方减X加Y

(X减Y)的三次方减X加Y
(x-y)^3-x+y
=(x-y)[(x-y)^2-1]
=(x-y)(x-y+1)(x-y-1)