已知x,y满足 x-y+1≥0 x+y-1≥0 3x-y-3≤0 ,则2x-y的最大值为___
已知x,y满足x-y+1≥0x+y-1≥03x-y-3≤0,则2x-y的最大值为______....
已知x,y满足 x-y+1≥0 x+y-1≥0 3x-y-3≤0 ,则2x-y的最大值为______.
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