设线段总长度为1,某一条线段为x,一条为y,另一条为1-x-y.以下按照线性规划问题解.
总区域为:x大于0小于1,y大于0小于1,1-x-y大于0小于1
目标区域为:x+y大于1-x-y,x-y小于1-x-y
然后按照几何概型的问题解.
小面积/大面积即可,自己算吧.答案是:1/4
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