先化简,再求值:(a2+2ab+b2/a2-2ab+b2)3次方乘以(b2-a2/a+b)3次方,其中a=2,b=-1

问题描述:

先化简,再求值:(a2+2ab+b2/a2-2ab+b2)3次方乘以(b2-a2/a+b)3次方,其中a=2,b=-1

(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...