$$ \begin{aligned}10r(16x+11)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}160rx+110r\end{aligned} $$ | |
① | Multiply $ \color{blue}{10r} $ by $ \left( 16x+11\right) $ $$ \color{blue}{10r} \cdot \left( 16x+11\right) = 160rx+110r $$ |