問題
$6\dfrac{12}{25}\div\bigg(◻︎-\dfrac{1}{5}\bigg)\times\dfrac{5}{9}=6$
解説
$6\dfrac{12}{25}\div\bigg(◻︎-\dfrac{1}{5}\bigg)=6\div\dfrac{5}{9}=\dfrac{54}{4}$
$\bigg(◻︎-\dfrac{1}{5}\bigg)=6\dfrac{12}{25}\div\dfrac{54}{4}$
$◻︎-\dfrac{1}{5}=\dfrac{3}{5}$より,
$◻︎=\dfrac{4}{5}$となります.
