cái wù kè shàng / lǎo shī / yòng / jǐ hé jí shù / shuō míng / fēn qī / xiàn jīn liú / de / zǒng é / rú hé / jì suàn

财务课上，老师用几何级数说明分期现金流的总额如何计算。

In the finance class, the teacher used geometric series to explain how to calculate the total of installment cash flows.