数学1入門1-3想定問題3

4. 分数の四則演算

$$\frac{5}{6} \times \frac{1}{2} – \frac{1}{4} = \\ \frac{3}{7} \div \frac{9}{5} \div \frac{2}{3} =\\ \frac{5}{9} – \frac{1}{6} \div \frac{9}{8} = \\ $$