(x+y分之x + x+y分之2y)除以x+2y分之xy除以(x分之1+y分之1)

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(x+y分之x+x+y分之2y)除以x+2y分之xy除以(x分之1+y分之1)(x+y分之x+x+y分之2y)除以x+2y分之xy除以(x分之1+y分之1)(x+y分之x+x+y分之2y)除以x+2y

(x+y分之x + x+y分之2y)除以x+2y分之xy除以(x分之1+y分之1)
(x+y分之x + x+y分之2y)除以x+2y分之xy除以(x分之1+y分之1)

(x+y分之x + x+y分之2y)除以x+2y分之xy除以(x分之1+y分之1)
[x/(x+y)+2y/(x+y)]÷xy/(x+2y)÷(1/x+1/y)
=(x+2y)/(x+y)×(x+2y)/xy×xy/(x+y)
=(x+2y)^2/(x+y)^2.