已知x+y=-5,xy=3,求（x-y）²的值

已知X-Y=-3,XY=2,求代数式（3X-5Y）-（X-3Y-4XY) 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（x+2）^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy 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) 已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y 已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值 已知xy=2(x+y),求5x-xy+5y/3xy-x-y的值 已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值 已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 已知xy/x+y=2,求代数式3x-5y+3y/-x+3xy-y 已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y) 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y）的值