若X/3=Y/4=Z/7,则3X+Y+Z/Y的值为注明解题思路,彭云杉说的有些麻烦 天之神—凤凰说的很简单易懂，

若3x+7y+z=5,4x+10y+z=3,则x+y+z=? 若4x-3y-6z=0,x+2y-7z=0,则x+y+z/3x-y+z=? 若x+y+z=3y=2z,则x/x+y+z=? 若{x-3y+z=0,3x+3y-4z=0,则x:y:z=? 若x/2=y/3=z/4,则3x-2y+5z/x+y+z= 若x+y:y+z:z+x=3:4:5,则x:y:z=?(急,) 若x:y:z=3：4：6,则x-y+z分之x+y-z的值为? 已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z= 若(4x-3y-3z)^2+|x-3y-z|=0 且xyz不等于0 则4x+y-z/x+y+z 的值 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,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— 已知{4x-3y-6z=0、x+2y-7z=0,则x-y+z：x+y+z= x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z 若x/2=y/3=z/4,则x+y+z/x=多少? x/2=y/3=z/4,则x+2y-z/z=? 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= x+y/2=z+x/3=y+z/4 x+y+z=27