说明：  要求出一个矩阵的逆矩阵有许多方法，这里介绍以 Gauss-Jordan Elimination 来求出逆矩阵的方法，算法函数用C++写成，可在C++编程环境下直接调用
(requested a matrix inverse matrix there are many ways here to introduce the Gauss-Jordan Elimination get to the inverse matrix method, the algorithm functions with C languages, the C programming environment called directly)