已知X,Y满足不等式x>=o,y>=o,x+2y
已知O点为坐标原点,点M(2,-1),点N(x,y)的坐标x,y满足不等式组x+y=-1,y>=0,则2x-y的最小值为
已知实数x,y满足不等式组:2x-y=0,x+2y
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x,y满足不等式x^2+y^2+2≤2x+2y,则x+2y=?
已知x,y满足2x-7y=3m,x+2y=4m+5,且x+y=o,求m的值
已知x,y满足约束条件x>=o y>=0 3x+4y>=4 则x^2+y^2的最小值是
已知X,Y满足X^2+7X+9=0,9Y^2+7Y+1=O,求代数式X^2-1/Y^2的值
已知x,y满足不等式组(y=0),x^2+y^2
已知实数x,y满足不等式2x-y>=0,x+y-4>=0,x
已知x,y满足不等式组:y>=1; x+y=0; 又已知0
已知xyz满足|3x-2y+z|+|2x+y+2z|=0(xyz不等于o)求x+y除以z
实数X,Y满足X大于等于Y大于等于1和2X平方-xy-5x+y+4=o,则x+y的值