已知[8x^3y^3-(-xy^2)^2]/A=-x^2y^2+1/8xy^3,求A*(3x^2y^4)/(2xy^3)的值

已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? 已知x^+xy=-5,xy+y^=8,求2x^-xy-3y^的值都是2次 由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少? 已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值 已知x-y=8 xy=7,则3xy-2x+2y+4(y-x)²=? 已知x,y为正整数,并且xy+x+y=71,x^2y+xy^2=880,求3x²+8xy+3y² 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+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x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)= 已知X+Y分之XY等于3,求-X+3XY-Y分之2X-3XY+2Y 已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值 已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值 已知x-y=3xy,求分式3x+2xy-3y/x-2xy-y的值