已知｜x｜=3,｜y｜＝5,若xy＜0,则x÷y的值等于

已知｜x｜=3,｜y｜＝5,若xy＜0,则x÷y的值等于 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y) 已知（X+Y-3）²+|5+XY|=0,则X-XY+Y 已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值 已知x,y>0 2x+y+3=xy 求5x+4y最小值 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xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值.已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值. 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值 已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y= 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知,xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值 已知,xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y)