| $$ \begin{aligned}\frac{22}{45sqrt\cdot(80-32sqrt\cdot3)}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{22}{3600qrst-4320q^2r^2s^2t^2}\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{45qrst} $ by $ \left( 80-96qrst\right) $ $$ \color{blue}{45qrst} \cdot \left( 80-96qrst\right) = 3600qrst-4320q^2r^2s^2t^2 $$ |