Решебник по математике 5 класс Виленкин ФГОС Часть 1, 2 Часть 2. Параграф 5. Обыкновенные дроби Задание 479

\[\boxed{\text{5.479.}}\]

\[\textbf{а)}\ \frac{3}{4} = \frac{12}{16} = \frac{15}{20}\]

\[\frac{8}{4} - \frac{5}{4} = \frac{3}{4}\]

\[\frac{15}{16} - \frac{3}{16} = \frac{12}{16}\]

\[\frac{18}{20} - \frac{3}{20} = \frac{15}{20}\]

\[\textbf{б)}\ \frac{3}{4} = \frac{9}{12} = \frac{21}{28}\]

\[\frac{1}{4} + \frac{2}{4} = \frac{3}{4}\]

\[\frac{6}{12} + \frac{3}{12} = \frac{9}{12}\]

\[\frac{17}{28} + \frac{4}{28} = \frac{21}{28}\]