x+y=3,xy=－2.求(3xy+10y)+〔5x-(2xy+2y-3x)〕kkkkkkkkkkkkkkkkkkx+y=3,xy=-2,x=?

x+y=3,xy=－2.求(3xy+10y)+〔5x-(2xy+2y-3x)〕kkkkkkkkkkkkkkkkkkx+y=3,xy=-2,x=? x-y=1,xy=2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 .已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 3X^2+XY+Y=15 求XY. 当x-y=2xy时,求4x-3xy-4y/xy 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? xy^2=-3,求-xy(x^2y^5-xy^3-y) 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=12,xy=9,求(x+3xy+y)/(xy+xy)的值 已知x:y=3:2,求(x²+3xy)/(xy+2xy) y'+xy=x^3求微分 1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值2.已知（x+3）^2+|x-y+10|=0求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 已知xy为正整数,3xy=2x+3y+5.求xy=? 若正实数xy满足x+y+3=xy.求xy的最小值