Question
Answer
$$\dfrac{5^7}{5^8}=\dfrac{1}{5}$$
Explanation
| $$ \begin{aligned}\frac{5^7}{5^8}& \xlongequal{ }\frac{78125}{390625} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}} \frac{ 78125 : \color{orangered}{ 78125 } }{ 390625 : \color{orangered}{ 78125 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{1}{5}\end{aligned} $$ | |
| ① | Divide both the top and bottom numbers by $ \color{orangered}{ 78125 } $. |
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