已知 3x-y+2z=0 2x+y-3z=0,求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 3x-y+2z=0 2x+y-3z=0,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4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知x+2y-3z=0,2x+3y+5z=0,求(x+y+z)除以(x-y+z)
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z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.
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/x-y+z的值.
已知3x+4y+5z=0,2x+3y-4z=0,求(x+y+z)/(x-y+z)
已知实数x,y,z满足关系式2x-3y-z=0,x-2y+z=0,求x比y比z的值