说明：  算法包括:1.二分法求解 2.牛顿法求解 3.高斯消去法求解 4.雅可比迭代法求解 5.拉格朗日插值 6.牛顿插值 7.最小二乘法拟合 8.龙贝格方法计算积分 9.欧拉方法求解初值问题
(algorithms include : 1. Solving two dichotomy. Newton method 3. Gaussian elimination method 4. Jacobi iterative method 5. Lagrange interpolation 6 value. Newton's seven. least-squares fitting 8. Long Bergh calculated integral 9. Euler method to solve initial value problems)