已知:5x/y=3z/y=y/x,求x+y+z/x(5x)/y=(3z)/y=y/x,求(x+y+z)/x

已知3X=4X,5Y=6Z求X+Y：Y+Z 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z 已知:5x/y=3z/y=y/x,求x+y+z/x(5x)/y=(3z)/y=y/x,求(x+y+z)/x 已知x:y=3:6,y:z=8:5求x:y:z 已知5x=3y,4z=7y,求x:y:z 已知x:y=3:5 y:z=6:1,求x:y:z( ):( ):( ) 已知X+Y=3,Y+Z=4,Z+X=5,求Z,X,Y的值. 已知{x-5y+2z=0 3x-5y-4z=0,求x：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(x+y)/3=(y+z)/4=(z+x)/5,求x比y比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