(x-y)乘(Y-X)的立方=

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(x-y)乘(Y-X)的立方=

(x-y)乘(Y-X)的立方=
(x-y)乘(Y-X)的立方=

(x-y)乘(Y-X)的立方=
=(x-y)[-(x-y)]³
=-(x-y)(x-y)³
=-(x-y)的4次方