已知5x+3y+2z=2011,4x+6y+7z=2012,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5x+3y+2z=2011,4x+6y+7z=2012,求x+y+z的值
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
已知4x-3y-6z=0,x+2y-7z=0,且x,y,z≠0,求2x+3y+6z/x+5y+5z的值.
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
已知x,y,z满足3x+7y+z=5 4x+10y+z=3 求x+y+z的值
已知x、y、z满足{3x+7y+z=5 ,求x+y+z的值 {4x+10y+z=3
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