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
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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
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
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
用线性规划,先画出x,y的区域,3x+y/x+1=3+(y-3/x+1)
y-3/x+1表示(x,y)到(-1,3)的斜率,在区域内寻找斜率的范围,然后加3就可以了
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