(x-y)的立方-4(x-y)的平方+4(x-y)怎么算

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(x-y)的立方-4(x-y)的平方+4(x-y)怎么算
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(x-y)的立方-4(x-y)的平方+4(x-y)怎么算
(x-y)的立方-4(x-y)的平方+4(x-y)怎么算

(x-y)的立方-4(x-y)的平方+4(x-y)怎么算
(x-y)的立方-4(x-y)的平方+4(x-y)
= (x-y) { (x-y)的平方-4(x-y)+4}
= (x-y)(x-y-2)的平方

(x-y)的立方-4(x-y)的平方+4(x-y)
=(x-y)[(x-y)²-4(x-y)+4]
=(x-y)(x-y-2)²