中文说明：
拉格朗日插值多项式拟合,牛顿插值多项式,欧拉方程解偏微分方程,使用极限微分求解导数（微分）,微分方程组的N=4龙格库塔解法,雅可比爹迭代法解方程AX=B,最小二乘多项式拟合,组合辛普生公式求解积分,用三角分解法解方程AX=B。
English Description：
Lagrange interpolation polynomial fitting, Newton interpolation polynomial, the partial differential equation, euler equations using the limit solving derivative (differential), differential equations of the N = 4 runge kutta method, Jacobi dad iterative method for solving equations AX = B, the least squares polynomial fitting, combination, Simpson formula to solve the integral equation AX = B with triangle decomposition method.