若x+2y+3z=11,3x+5y+7z=27,求x+y+z的值.

若x/3=y/4=z/5,求x+y+z/3x-2y+z的值. 若x+2y+3z=11,3x+5y+7z=27,求x+y+z的值 若x+2y+3z=11,3x+5y+7z=27,求x+y+z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. 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 若2分之x+y=3分之y+z=5分之x+z 且x+y+z=18 求x,y,z的值 若x,y,z,满足3x+2y+z=5,2x+y-3z=1.y是非负数.求z的取值范围 已知x/2=y/4=z/7,求①x：y：z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+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,且X+Y+Z=24,求X、Y、Z的值 若x:y:z=2:3:4,求x+y+z/x-2y+3z的值