zhè / dào / shù / xué / tí / yāo / qiú / yòng / qiú / hé / gōng / shì / jì / suàn / shù / liè / de / zǒng / hé

这道数学题要求用求和公式计算数列的总和。

This math problem requires calculating the sum of the sequence using the summation formula.