已知x/3=y/5=z/6,求3x-2y+z/2x+y+2z的值

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(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知3X=4X,5Y=6Z求X+Y：Y+Z 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. 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 已知x:y=3:6,y:z=8:5求x:y:z 已知x:y=3:5 y:z=6:1,求x:y:z( ):( ):( ) 已知3x=4Y,5Y=6Z,求 (1)x:y:z;（2）x+y/y+z.请说明道理， 已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 已知x:y:z=1:3:5,求（2x+3y-z)/(x+y-2z)的值 已知X:Y:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,求x:y:z 已知x+y-z=0,2x-y+2z=0 求（3x-2y+5z)/(5x-3y+2z)的值