已知| y/x|=3,求分式[(x2+2*x*y+y2)*(x-y)]/[x2*y2*(x-2*y)]的值

已知| y/x|=3,求分式[(x2+2*x*y+y2)*(x-y)]/[x2*y2*(x-2*y)]的值 已知x/y=2/7,求分式(x2-3xy+2y2)/(x2-2xy+y2)的值 已知x/y=2/7,求分式x2-3xy+2y2/x2-2xy+y2的值 已知x+2y=0(x不等于0）求分式2xy+y2/x2-xy 已知x+1/x=3,求分式x2+1/x2的值 已知2分之x=3分之y=4分之z,且xyz不等于0,求分式x2+y2+z2分之xy+yz+zx的值 已知x/2=y/3,求分式(3x+2y)/(2x-3y)的值. 已知2x-3y=0,求分式x^2+xy-y^2/2x^2+xy-y^2 已知2x-3y=0,求分式x^2+xy-y^2/2x^2+xy-y^2 已知x-y=3xy,求分式3x+2xy-3y/x-2xy-y的值 已知x+y=5,求分式2x+2y-3÷5-3x-3y的值 已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值. 已知1/x-1/y=3,求分式(2x+3xy-2y)/(x-2xy-y) 已知x/3=y/4=z/5,求分式x+y/x-2y+3z的值 已知1/x-1/y=5,求分式2x+5xy-2y/3x-xy-3y 已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值 已知,1/x+1/y=5.,求分式3x+xy+3y/x-2xy+y的值 已知3x-y=0,求分式2x²+6y/4y-6x的值