说明：关于c语言中一些常见的问题的源代码，例如，冒泡排序，水仙花数，求二次方程等。

C language on some common problems of the source code, for example, bubble sort, daffodils, seeking quadratic equations, etc.

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研究了具有边界摄动的二次方程奇摄动问题。

In this paper, the singularly perturbed problems for a class of second degree equations with boundary perturbation are considered.

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针对多变量二次方程组的求解问题，对XL算法的冗余性进行分析与改进。

Aiming at problems of solving multiple quadratic equation systems, the redundancy of extending equations by Extended Linearization (XL) algorithm is analyzed.

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