x+2y-8≤0 x-4y+4≤0 x≥0求z=3x-y最值
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(z-x)∧2-4(x-y)(y-x)=0求x+z-2y+8的值
已知x,y满足条件7x-5y-23≤ 0,x+7y-11≤ 0,4x+y+10 ≥0,求:z=4x-3y的最值
若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值
已知2x+3y-4z=0,3x+3y+5z=0,求x+y+x/x-y+z的值
已知4x-3y-6y=0,x+2y-7z=0.求x-y+z\x+y+z的值
已知x,y,z满足方程组:4x-5y+2z=o;x+4y-3x=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.
2x+3y-4z=0,3x+4y+5z=0,求x+y-z/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