输入三角形的三个边就能计算出三角形的周长，面积，以及判断它的类型（钝角，锐角，直角），画面很炫，绝对原创-The input three sides of the triangle will be able to calculate the triangular perimeter, area, and to determine its type (an obtuse angle, acute angle, right angle), the picture is stunning, absol

构建Delaunay三角网,自定义点，生成三角网格。-Construction of Delaunay Triangulation, custom points, generate triangular mesh.

高斯消元法解n维线性方程组,即输入为n维矩阵，将矩阵变为上三角矩阵，再反代-Gauss elimination method for solving n-dimensional linear equations, ie, the input is n-dimensional matrix, the matrix becomes upper triangular matrix, and then anti-generation