(a2+2ab+b2/a2-2ab+b2)3次方 ×（b2-a2/a+b）3次方,= [ (a+b)²/(a-b)²]³ × [-(a+b)(a-b)/(a+b)]³= - [ (a+b)²/(a-b)² × (a+b)(a-b)/(a+b) ]³= - [ (a+b)²/(a-b) ]³...