列主元消元法解线性方程组（已通过验证） LU分解法解线性方程组（已通过验证）： 雅可比迭代法（已通过P54例一和习题一的验证）高斯---赛得尔迭代法 拉哥朗日插值公式（乘幂法 -main-element elimination method for solving linear equations (validated) LU decomposition method for solving linear equations (which has been validated