xy+ 2=0,x+y-3=0求(3xy+10y))+[5x-(2xy+2y-3x)]
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值
已知y=3xy+x,求代数式2x+5xy-2y/x-2xy-y的值(xy≠0)
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
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X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y
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-y=2xy,求代数式3x-5xy-3y/x+xy-y的值