若x/2=y/3=z/6,求(3x+4y-2z)/（x-y+3x）的值

已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. x+2y=3x+2z=4y+z 求x:y:z 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若x:y:z=3:4:5=6,求x-y+z分之x+y-z的值 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值 求适合方程组 3x+2y-z=4 2x-y+2z=6 x+y+z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 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. 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 已知3X=4X,5Y=6Z求X+Y：Y+Z 方程组{x/2+y/3-z=-5,x/3-y/2+z/2=10,x/2-y/3-z/4=6,求x,y,z x+y-z=6(1) x-3y+2z=1(2) 3x+2y-z=4(3) 求X Y Z 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