求最值问题是中等数学永恒的话题，其中，多元函数求最值是难点。

Seeking the maximum and minimum of function is the perpetual topic in the medium-sized mathematics, and the function of many variables are difficulties.

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求最值问题是中等数学永恒的话题，其中，多元函数求最值是难点。

The teaching of function of several variables is a difficult point in higher mathematics teaching.

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线形规划：求线性函数在线性约束下达最值的问题。

Linear planning: it's the issue for computing the minimum or maximum value of linear function under the linear constraint.

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