已知|x-1|+|y-2|+|z-3|=0,则x+2y+3z=______.
已知|x-1|+|y-2|+|z-3|=0,则x+2y+3z=______.
已知2x-y-z=0,3x+4y-2z=0,则x:y:z=______.
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
已知实数z、y、z满足x+y=5及z2=xy+y-9,则x+2y+3z=______.
已知2x+5y+4z=15,7x+y+3z=14,则4x+y+2z的值为______.
已知3x+7y+4z=35,x+5y+2z=40,则x+y+z=______.
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
已知x+2y-4z=0,3x-y-z=0,则3x+2y+z/x+2y+z=
已知x-y+z=0,3x+y-5z=0,则x+y+z/x+2y-3z=?
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
已知实数 x y z 满足x+y-z=0 ,3x-y+2z=0 则x :y :z