矩阵的加法，减法和乘法 二元方程的解法 日期，可以输出N天前和N天后的年月日-Matrix addition, subtraction and multiplication two yuan Equation in date N days ago, and can output the years at N days

matlab 高斯列主元消去法求解线性方程组程序，可用于求解任何元数方程组-Matlab gaussian column primary elimination method solving system of linear equations procedures, can be used to solve any yuan number equations