Graphical programming is usually considered a more advanced topic, but with the proper tools it is not much harder, and it will help to make things more clear.

图形编程通常被认为是高级的题目，但是有了恰当的工具，它便不再困难了，并且能够帮助我们更清楚的了解编程。

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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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