(x+y)²×(－x-y)³

(x+y)²×(－x-y)³
(x+y)²×(－x-y)³

(x+y)²×(－x-y)³
(x+y)²×(－x-y)³
= - (x+y)²×(x+y)³
= - (x+y)^5
肯定对
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(x+y)²×(－x-y)³
=（x+y）²×[-(x+y)³]
=-（x+y）²×（x+y）³
=-（x+y）^5