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代码说明：

说明：  体会数值算法的稳定性与不稳定性，线性方程组的迭代法，包括Jacobi迭代法和Gauss-Seidel迭代法，SOR迭代(Experience of numerical stability and instability of the algorithm to learn how to avoid instability in the algorithm and numerical stability of the algorithm chosen to experience the stability of the algorithm' s status in the selection algorithm)