(x+y)的立方—9(x+y)的平方怎么算?

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(x+y)的立方—9(x+y)的平方怎么算?

(x+y)³-9(x+y)²
=(x+y)²(x+y-9)

(x+y)^3-9(x+y)=(x+y)(x+y+3)(x+y-3)

(x+y)³-9(x+y)²
=(x+y)²(x+y-9)

(x+y)^3-9(x+y)^2=(x+y)^2(x+y-9)