(x-y)的三次方+9(x-y)-6(x-y)的平方

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(x-y)的三次方+9(x-y)-6(x-y)的平方

(x-y)的三次方+9(x-y)-6(x-y)的平方
(x-y)的三次方+9(x-y)-6(x-y)的平方

(x-y)的三次方+9(x-y)-6(x-y)的平方
(x-y)^3+9(x-y)-6(x-y)^2
=(x-y)[(x-y)^2-6(x-y)+9]
=(x-y)[(x-y)-3]^2
=(x-y)(x-y-3)^2

因式分解还是计算?