变上限积分是积分学的一个重要理论，其运算结果仍以函数的形式体现。研究这类函数，得出几个颇有理论意义的定理。
Integral that upper limit of integral is variable is a important theory, results of operation is function forma after all. Research this kind of function, get a few theorem.
利用部分分式求有理函数的积分时，确定部分分式的系数的计算量很大，举例介绍如何确定部分分式的待定系数。
Abstract:The solutions to determine the undetermined coefficients of partial fraction in the rational function integral is introduced.
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