说明：  用matlab的APP Designer做的线性方程求解器，可供参考 包括克莱姆法则、高斯消去法、列主元消去法、LU分解法、平方根法、三角追赶法等
(The linear equation solver made by app designer of MATLAB is available for reference. It includes Cramer's law, Gauss elimination, column principal component elimination, LU decomposition, square root, triangle pursuit.)