已知3x^2+xy-2y^2=0,

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3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知x-y=4xy，则2x+3xy-2yx-2xy-y 由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少? 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)} 已知y=3xy+x,求代数式2x+5xy-2y/x-2xy-y的值(xy≠0) 已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y的值 已知2x-3y=0,求分式x^2+xy-y^2/2x^2+xy-y^2 已知2x^2-3xy+y^2=0,xy不等于零,求x/y+y/x的值 已知x^2-xy+3y^2=0 且xy不等于0 求x/y+y/x 的值 已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.