化简求值 (a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1
问题描述:
化简求值 (a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1
答
(a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1
=(a-b)/(a+2b)乘以(a²+4ab+4b²)/(a²-b²)-1
=(a+2b)/(a+b)-1
=b/(a+b)a=-2 b=-1 求值a=-2 b=-1 b/(a+b) =1/3