| $$ \begin{aligned}\frac{1}{19\cdot84+22\cdot5}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{1}{1706}\end{aligned} $$ | |
| ① | Simplify denominator $$ \color{blue}{1596} + \color{blue}{110} = \color{blue}{1706} $$ |