若X/3=Y/4=Z/5,求（X+Y)/(X-2Y+3Z)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. 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=3:4:5且x+y+z=24,求x、y、z的值 若x:y:z=3:4:5 x+y+z=24 求x,y,z的值 若X:y:Z=3:4:5,且X+Y+Z=24,求X、Y、Z的值 若实数x,y,z满足x+y+z=4[√(x-5)+√(y-4)+√(z-3)]求x,y,z的值 (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3X=4X,5Y=6Z求X+Y：Y+Z 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z x+2y=3x+2z=4y+z 求x:y:z 1.若3x-2y+z=2;3x+2y+5z=4,求x+22.若x-3y+z=0;3x-3y-4z=0,求x:y:z 若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 若|x-3|+|y+4|+z-5|=0,求代数式x+y-z的值 若X.Y.z满足2X+3Y+z=18,4X-3Y+5z=24,求X+3Y的值 若X/3=Y/4=Z/5,求（X+Y)/(X-2Y+3Z)的值 3x=4y 2y=5z 试求x:y:z