若实数x，y满足x−y+1≥0x+y≥0x≤0

若实数x，y满足x−y+1≥0x+y≥0x≤0 若实数x，y满足x≥1x+y≤4x−2y+c≤0 若实数x、y，满足x≥0y≥04x+3y≤12 若实数x，y满足条件0≤x≤10≤y≤22y−x≥1 若实数x，y满足不等式组x-y+1≥0x+y-1≤0y≥0 若实数x,y满足约束条件x-y≥0,x+y≥0,2x+y≤1,则y/(x+1)的最大值是多少, 已知实数x，y满足x−y+5≥0x≤3x+y≥0 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 设实数x，y满足不等式组y+x≤1y-x≤1y≥0 若实数x,y满足{x-y+1≥,x>0},则y/(x-1)的取值范围是 若实数x,y满足x-y+1>=0,x+y>=0,x 若实数x,y满足x-y+1》=0,x+y>=0,x