This paper solves some special estimating value problems of double integral with the help of the optimality principle and graphical solution of the linear programming.

利用线性规划论的最优性原理和图解法解决一些特殊二重积分的估值问题。

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In a series of problem in probability calculation need for understanding the signification of integral variable and using graphical representation as an assistant tool.

在概率的一系列计算问题中，需要准确认识积分中变量的意义和利用图示作为辅助工具。

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