若x,y满足：0

若x,y满足：0 若x,y满足y 若实数x,y满足{2x-y>=0, .若x、y满足约束条件 x - y +1≥0 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 若实数x，y满足(x+x 若x，y满足2x+y-1≤0y≥0x≥0 若实数x,y满足不等式组x>=0 ,y>=0,x+2y 若实数x、y，满足x≥0y≥04x+3y≤12 若变量x，y满足约束条件x+y≤2x≥1y≥0 若有理数数x，y满足xy≠0，则m＝x|x|+|y|y