問題
$\bigg\{\dfrac{3}{4}-\bigg(1.75-\fbox{ }\bigg)\div\dfrac{1}{2}\bigg\}\div\dfrac{1}{2}=0.5$
解説
$\dfrac{3}{4}-\bigg(\dfrac{7}{4}-\fbox{ }\bigg)\times2=\dfrac{1}{4}$
$\bigg(\dfrac{7}{4}-\fbox{ }\bigg)\times2=\dfrac{1}{2}$
$\dfrac{7}{4}-\fbox{ }=\dfrac{1}{4}$
$\fbox{ }=$$1\dfrac{1}{2}$
