设x,y满足约束条件x>=0 y>=x 4x+3y
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设x,y满足约束条件x>=0 y>=x 4x+3y
设x,y满足约束条件x>=0 y>=x 4x+3y
设x,y满足约束条件x>=0 y>=x 4x+3y
平面区域的三个顶点为O(0,0),A(0,14/3),B(2,2)
(y+1)/(x+2)即是区域内一点P(x,y)与点C(-2,-1)连线的斜率.
由数形结合可知1/2≤kPC≤17/6.
所以(y+1)/(x+2)的取值范围是[1/2,17/6]
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