用二分法和简单迭代法计算 在[1，2]内的近似根，要求精度达到10-4和10-5，并给出二分和迭代的次数，分析和比较算法的效率差异，最后与理论估计的二分和迭代次数作比较。-Calculated by the dichotomy and simple iterative method in [1,2] within the approximate root, requiring precision 10-4 and 10-5, and gives two points and the number of iterations, the efficiency gap analysis and comparison algorithms, and the final theory two points and the estimated number of iterations for comparison.