To give better advice on teaching, futher discussion, is made on how to simplify the double integral operation with symmetry, precisely and effectively.
为更好地指导教学，文章还对如何准确、有效地利用对称性简化二重积分的计算作了进一步的探讨。
The way of accelerating iteration process was discussed also. By improving Simpson's algorithm, for variable step length, integral operation may increase in speed by one to dozens of times.
本文还讨论了加速迭代过程的方法，将变步长辛普生积分算法作适当的改进，其积分运算速度可提高一到几十倍。
The way of accelerating iteration process was discussed also. By improving Simpson's algorithm, for variable step length, integral operation may increase in speed by one to dozens of times.
本文还讨论了加速迭代过程的方法，将变步长辛普生积分算法作适当的改进，其积分运算速度可提高一到几十倍。
应用推荐