已知x/2=y/3=z/4且x+y+z=12求2x+3y+4z
已知x+y/2=y+z/3=z+x/4,且x+2y+z=12,求x-2y+z的值
已知x:y:z=2:3:4,且x-y+z=36,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
已知x/2=y/3=z/4,且x+y+z不等于0,求2x+3y-4z/x+y+z的值
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y-
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
已知x+y/2=y+z/2=x+z/4,且x+2y+z=12,求x-2y+z
已知方程组4x-y+3z=0 2x+y+6z=0且xyz不等于0,则x/y+y/z+z/x是多少
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
已知x/3=y/4=z/2,求x+2y-z/x+y+z=?
已知x/2=y/3=z/4且x+y+z=12求2x+3y+4z