已知2x+5y+4z=15,7x+y+3z=14,则4x+y+2z的值为______.
已知2x+5y+4z=15,7x+y+3z=14,则4x+y+2z的值为______.
若4x=7y+5z,2x+y=z,则x:y:z的值为
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知3x+7y+4z=35,x+5y+2z=40,则x+y+z=______.
已知4X=7Y+5Z,2X+Y=Z,那么X:Y:Z的值是?
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2x+5y+4z=15.7x+y+3z=14 则x+y+z=?
若x+y+z=30,3x+y-z=50,x,y,z都为非负实数,则M=5x+4y+2z的取值范围是______.
已知2x+5y+4z=15,7x+y+3z=14,求4x+2y+2z的值
已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.