设实数x,y满足x+y-5>0,2x+y-7>0,且x≥0,y≥0
2个回答
答:
x和y满足x+y-5>0,2x+y-7>0,x>=0,y>=0
在平面直角坐标系中表示下图两条直线上方区域,不包括两条直线上的点:
交点为A(2,3)
点(5,1),3x+4y=19
应该选择D
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