化简求值 (a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1

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化简求值 (a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1

化简求值 (a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1
化简求值 (a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1

化简求值 (a-b)/(a+2b)除以(a²-b²)/(a²+4ab+4b²)-1
(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)

原式=b/(a+b)