(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
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(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) 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) 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
(xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以(xy)/(x-y)= -x(x-y)乘以(xy)/(x-y)= -x^2y这样做对吗?
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(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
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