摘要
本文对如何确定积分秩序和选取变量作了详细的论述 ,并给出了解题的关键和技巧。
In this paper, the author give a detailed exposition about how to fix the sequence of integral and how to select the key and skill of solving the problem.
关键词
重积分
累次积分
投影
积分秩序
换元积分法
mulriple-Integral many times integral sequence of integral exchanging unit integral method
