(y根号x+x根号y)/(xy-y^2)-(x+根号xy+y)/(x根号X-y根号y)=根号xy*(根号y+根号x)/[y(根号x+根号y)(根号x-根号y)]-(x+根号xy+y)/[x^3/2-y^3/2)=根号xy/[y(根号x-根号y)-(x+根号xy+y)/[(根号x-根号y)*(x+根号xy+y)]=根号xy/[y(根号x-根号y)]-1/(根号x-根号y)=[根号xy-y]/[y(根号x-根号y)]=根号y(根号x-根号y)/[y(根号x-根号y)]=根号y/y