线性方程组求解算法实现。包括了列主元消元法、直接LU分解法、雅克比迭代、高斯赛德尔迭代法。并且对四个算法实现做了不太规范的、简单的类封装。原创代码，含详细注释。希望对用到数值计算的带来帮助。-Algorithm for solving linear equations. Including the main-element elimination method, the direct LU decomposition, Jacobi iteration, high Sisaideer iteration. And the four algorithms do not standardized, simple class package. Original code, with detailed notes. Want to use to bring numerical help.