已知x/6=x/4=x/3(x、y、z均不为零）则x+3y/3y-2z等于多少/代表分数线前是分子后是分母

已知3X=4X,5Y=6Z求X+Y：Y+Z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值 已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值. 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 已知x/3=y/4=z/6,求x+y-z/x-y+z的值. 已知x/3=y/4=z/6≠0,求x+y-z/x-y+z的值 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知4x-3y-6z=0,x+2y-7z=0(x,y,z均不为0) ,求(2x+3y+6z)/(x+5y+5z)的值 已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值 已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值 已知X+Y/2=Y+Z/3=Z+X/4,且2X+4Y+6Z=120,求X,Y,Z的值 已知x+y/2=y+z/3=x+z/4 且2x+4y+6z=120,求x、y、z的值 已知：4x-3y-6z=0,x+2y-7z=0.求出x-y+z÷x+y+z=? 已知4x-3y-6z=0,x+2y-7z=0,则x-y+z/x+y+z=_________ 已知4x-3y+6z=0 x+2y-7z=0 则x-y+z/x+y-z=? 已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z：x+y+z=