若X+2Y+3Z=10.4X+3Y+2Z=15,求X+Y+Z的值
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
若x:y:z=2:3:4,求x+y+z/x-2y+3z的值
若x/2=y/3=z/4不等于0,求x+y+z/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.
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
若X+2Y+3Z=10.4X+3Y+2Z=15,求X+Y+Z的值
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.
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
已知2x=3y=4z求2x-y+z分之x+y+z的值
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值