若x:y:z=1:3:5,求分式x+3y-z/x-3y+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.
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,且X+Y+Z=24,求X、Y、Z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
已知x/2=y/3=z/-1≠0,求分式2x+6y-3z/x+y+2z的值
已知X,Y,Z是三个非零数,且X:Y:Z=4:3:1,求分式2X-3Y+5Z除于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
若x:y:z=2:3:4,求x+y+z/x-2y+3z的值
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
x+2y+3z=20,x+3y+5z=31,求x+y+z的值