(x/x+y+2y/x+y)乘以xy/x+2y除以(1/x+1/y) 用分式加减2怎么做

问题描述:

(x/x+y+2y/x+y)乘以xy/x+2y除以(1/x+1/y) 用分式加减2怎么做

(x/x+y+2y/x+y)乘以xy/x+2y除以(1/x+1/y)
=((x+2y)/(x+y))*xy/(x+2y)/((x+y)/xy)
=(xy/(x+y))*(xy/(x+y))
=x^2y^2/(x+y)^2