如何在分数求和的顶部和底部放置极限值

Question

我试图将此等式中求和符号的上限和下限写为

\[Average~accuracy =\displaystyle \frac{\sum_{i=1}^{6}{Accuracy_i}}{i}=94.45\%\]

或者

$Average~accuracy =\displaystyle \frac{\sum_{i=1}^{6}{Accuracy_i}}{i}=94.45\%$

但两者都在边缘打印了界限。有没有办法像我们用笔和纸书写一样在顶部和底部打印它们？

Answer 1

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\text{Average accuracy} = \frac{\displaystyle\sum_{i=1}^{6}{\text{Accuracy}_i}}{i}=94.45\%
\]

\[
\text{Average accuracy} = \frac{\sum\limits_{i=1}^{6}{\text{Accuracy}_i}}{i}=94.45\%
\]
\end{document}