5x+3y=25,2x+7y-3z=19,3x+2y-z=18,求x,y,z的值
5x+3y=25,2x+7y-3z=19,3x+2y-z=18,求x,y,z的值
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
已知x:y:z=2:3:4,且x+y+z=18,求x,y,z的值
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
若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: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+y-z=0,2x-y+2z=0 求(3x-2y+5z)/(5x-3y+2z)的值
已知有理数x,y,z满足|x-z-2|+|3x-6y-7|+(3y+3z-40)^2=0,求x,y,z的值