已知x-y=3xy,则2x+3xy-2y/x-2xy-y=

已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)= 已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=? 已知x-y=3xy,则2x+3xy-2y/x-2xy-y= 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知xy/x+y=3,则代数式2x-7xy+2y/-x+xy-y的值是多少? 由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少? 已知x/y=3/4 ,则3xy-2y/2x+4xy=? 已知x+y=2,xy=3,则x²+y²-3xy=? 已知x+y=6,xy=-3,则x^2y+xy^2=? 已知x+y=5,xy=-3,则x^2y+xy^2, 已知x+y=6,xy=-3,则x∧y+xy∧2= 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理. 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy^2=-2 求-xy(x^2y^5-xy^3-y) 已知xy^2=-2xy(x^2y^5-xy^3-y) 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知：x²-xy=9,xy-y²=5,则x²-2xy+y²=（）,3x²+xy-2y²+（）