已知x/2=y/3=z/5,求分式x+3y-z/2x-y+z的值已知x/2=y/3=z/5,求分式x+3y-z/x-3y+z的值

已知x/3=y/4=z/5,求分式x+y/x-2y+3z的值 已知x/y+z=y/x+z=z/x+y,分式(x+2y+3z)/(2x+5y-2c)有意义时的值 已知x/2=y/3=z/5,求分式2x+3y-z/3x-2y+z 已知x/3=y/4=z/5 求 分式y^2+z^2-x^2/x^2+z^2-y^2 已知3x=4y=6z,求分式x+y-z/x-y+z的值急 已知3x=4y=6z,求分式x+y-z/x-y+z 一道有关分式性质的题目!已知3x=2y=5z不等于0,求x+2y+3x/x-y+z 值 已知x/2=y/3=z/4,求分式4x－3y+5z/2x+3y=? 已知x/2=y/3=z/5,求分式x+3y-z/2x-y+z的值已知x/2=y/3=z/5,求分式x+3y-z/x-3y+z的值 已知x/2=y/3=z/-1≠0,求分式2x+6y-3z/x+y+2z的值 已知 x/2=y/3=z/4 求分式2x+y-3z/x-y+2z的值 已知x/2=y/3=z/0.5,求分式x+3y-z/2x-y+z的值 现有一道题,已知x/2=y/3=z/4,求分式(x+2y-z)/(x+y-3z) 已知x/2=y/3=z/4,试求x+y-z/x+y+z的值初二分式里的题 已知X/2=y/3=z/4,试求x+y-z/x+y+z的值 （这是初二分式） 要过程 一条分式数学题已知x y z满足x/x+y + y/z+x + z/x+y =1,求x²/x+y + y²/z+x + z²/x+y的值.3Q 已知X,Y,Z是三个非零数,且X:Y:Z=4:3:1,求分式2X-3Y+5Z除于X+y+Z的值 若x：y：z=1:3:5,求分式x+3y-z/x-3y+z的值