原式=(a+b)(a-b)/[(a+b)(a²-ab+b²)]÷[(a-b)²/(a²-ab+b²)]×[1/(a-b)²]
=[(a-b)/(a²-ab+b²)]×[(a²-ab+b²)/(a-b)²]×[1/(a-b)²]
=1/(a-b)³题目比较乱,你可能看错了,我再发一次 a²-b²/a³+b³ ÷ a²-2ab+b²/a²-ab+b²×1/(b-a)²你好:没错!(a²-b²)/(a³+b³)=(a+b)(a-b)/[(a+b)(a²-ab+b²)]=(a-b)/(a²-ab+b²) (a²-2ab+b²)/(a²-ab+b²)=(a-b)²/(a²-ab+b²) 1/(b-a)²=1/(a-b)² 原式=[(a-b)/(a²-ab+b²)]÷[(a-b)²/(a²-ab+b²)]×[1/(a-b)²]=[(a-b)/(a²-ab+b²)]×[(a²-ab+b²)/(a-b)²]×[1/(a-b)²]=(a-b)/(a-b)^4=1/(a-b)³ 同学,绝对没有错!
