x-y+2≥0x+y-4≥02x-y-5≤0则目标函数z=x^2+y^2-10y+25的最小值为

y满足x-y+2≥0,x+y-4≥0,2x-y-5≤0 求X^2+Y^2-10Y+25的最小值 x*x+2x+y*y-4y+5=0 x= y= 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x+y≤5,2x-y≥4,求x+2y的最大值 4x+2y-5x-y 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) 已知 x y 满足约束条件 x-y+5≥0 x+y≥0 x≤3 z=2x+4y的最小值为 已知 x y 满足约束条件 x-y+5≥0 x+y≥0 x≤3 z=2x+4y的最大值为 实数x'y满足x≥y≥1和2x^2-xy-5x+y+4=0求x'y的值 实数X、Y满足X≥Y≥1和2X^2-XY-5X+Y+4=0,则X+Y= 实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值 若实数x,y满足x-4y+3≤0,3x+5y-25≤0,x≥1,则2x-y的最大值是多少 实数x,y满足条件x+y-4≤0,x-2y+2≥0,x≥0,y≥0,则x-y的最小值为 若实数x,y满足不等式组｛x+y≥2 ｛2x-y≤4 ｛x-y≥0 ,则2x+3y的最小值是? 若x,y满足不等式x+y≥2,2x-y≤4,x-y≥0,则2x+3y的最小值为多少 若x,y满足不等式x+y≥2,2x-y≤4,x-y≥0,则2x+3y的最小值为多少1111 已知x.y满足(x-y-2≤0,x 2y-5≥0,y-2≤0 则3x+y/x+1得多少