先化简再求值a²-b²/a²-2ab+b²+2a-ab/b-2÷a
问题描述:
先化简再求值a²-b²/a²-2ab+b²+2a-ab/b-2÷a
答
a²-b²/a²-2ab+b²+2a-ab/b-2÷a
=(a+b)(a-b)/(a-b)²+a(2-b)/(b-2)÷a
=(a+b)/(a-b)-1
=(a+b-a+b)/(a-b)
=2b/(a-b)
如果本题有什么不明白可以追问,
请点击下面的【选为满意回答】按钮,