数值分析：

lagrange插值与三次样条插值

simpson复化积分和两点高斯复化积分

四阶龙格—库塔解微分方程

牛顿下山法求解方程的根

列主元消去法求解线性方程组的根

-Numerical Analysis: lagrange interpolation and cubic spline interpolation simpson recovery of complex points and two points of the Gaussian integral Runge- Kutta Solutions of Newton descent method for solving differential equations root out the main element elimination method for solving linear equations root