(x+y)²-(x+y)³等于多少啊

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(x+y)²-(x+y)³等于多少啊(x+y)²-(x+y)³等于多少啊(x+y)²-(x+y)³等于多少啊(x+y)²-(x+y

(x+y)²-(x+y)³等于多少啊
(x+y)²-(x+y)³等于多少啊

(x+y)²-(x+y)³等于多少啊
(x+y)²-(x+y)³
=(x+y)^2(1-x-y)