Решебник по математике 5 класс Виленкин ФГОС Часть 1, 2 Часть 2. Параграф 5. Обыкновенные дроби Проверочная работа. Сокращение дробей

\[\boxed{\text{Проверьте\ себя}\text{.\ Страница\ 61}}\]

\[\boxed{\text{Проверочная\ работа}\text{.\ Сокращение\ дробей}}\]

\[\boxed{\text{1.}}\]

\[\frac{2}{6} = \frac{1}{3};\]

\[\frac{4}{8} = \frac{1}{2};\]

\[\frac{3}{9} = \frac{1}{3};\]

\[\frac{10}{12} = \frac{5}{6};\]

\[\frac{12}{24} = \frac{1}{2};\]

\[\frac{24}{42} = \frac{4}{7};\]

\[\frac{36}{42} = \frac{6}{7};\]

\[\frac{180}{270} = \frac{18}{27} = \frac{2}{3};\]

\[\frac{100}{500} = \frac{1}{5}.\]

\[\boxed{\text{2.}}\]

\[\textbf{а)}\ \frac{x}{15} = \frac{1}{5}\]

\[\frac{3}{15} = \frac{1}{5}\]

\[x = 3.\]

\[\textbf{б)}\ \frac{10}{12} = \frac{5}{x}\]

\[\frac{10}{12} = \frac{5}{6}\]

\[x = 6.\]

\[\textbf{в)}\ \frac{8}{x} = \frac{2}{4}\]

\[\frac{2}{4} = \frac{8}{16}\]

\[x = 16.\]

\[\textbf{г)}\ \frac{18}{27} = \frac{x}{3}\]

\[\frac{18}{27} = \frac{2}{3}\]

\[x = 3.\]

\[\boxed{\text{3.}}\]

\[1\ ч = 60\ мин.\]

\[\frac{3}{60} = \frac{1}{20};\]

\[\frac{5}{60} = \frac{1}{12};\]

\[\frac{15}{60} = \frac{1}{4};\]

\[\frac{20}{60} = \frac{1}{3};\ \]

\[\frac{25}{60} = \frac{5}{12}.\]

\[\boxed{\text{4.}}\]

\[\textbf{а)}\ \frac{30}{80};\]

\[\textbf{б)}\ \frac{63}{99}\text{.\ }\]

Глава 35. Приведение дробей к общему знаменателю