点击文件系统首先输入一个三对角矩阵。初始化，求解，显示过程和为一体，当根据提示输入三对角矩阵与常数向量后，根据三对角矩阵的阶数给出未知量的个数。并显示出来，最后显示出中间变量Y，和最后解向量x。-Click file system first enter a tridiagonal matrices. Initialization, solving process, as a whole, and that when the input tridiagonal matrices and cons