若x^2+xy-2y^2=0,则(x^2+3xy+y^2)/(x^2+y^2)=______?

若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少? 已知 x-3*根号(xy)-4y=0,则 [2x+3*根号(xy)-2y]/[3x-根号(xy)+y]=______ 若x+y分之xy=2,则-x+3xy-y分之3x-5xy+3y=______ 已知x-y=4xy，则2x+3xy-2yx-2xy-y 若x^2+xy-2y^2=0,则(x^2+3xy+y^2)/(x^2+y^2)=______? 若实数x，y满足xy+x+y+7=0，3x+3y=9+2xy，则x2y+xy2=______． 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值 若y-x/xy=3,求分式2x+3xy-2y/x-2xy-y （-3x^y+2xy)-( )=4x^+xy 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=