Решебник по математике 5 класс Мерзляк ФГОС Решаем устно параграф 36

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

\[1)\ \frac{2}{7} = \frac{2 \cdot 3}{7 \cdot 3} = \frac{6}{21};\]

\[2)\ \frac{30}{36} = \frac{30\ :6}{36\ :6} = \frac{5}{6}.\]

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

\[1)\ \frac{1}{4} = \frac{3}{12}\]

\[2)\ \frac{1}{3} = \frac{4}{12}\]

\[3)\ \frac{3}{4} = \frac{9}{12}\]

\[4)\ \frac{5}{6} = \frac{10}{12}\]

\[5)\ \frac{3}{2} = \frac{18}{12}\]

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

\[1)\ \frac{1}{10} = \frac{10}{100}\]

\[2)\ \frac{3}{20} = \frac{15}{100}\]

\[3)\ \frac{7}{25} = \frac{28}{100}\]

\[4)\ \frac{23}{50} = \frac{46}{100}\]

\[5)\ \frac{124}{200} = \frac{62}{100}\]

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

\[1)\ 1\ мес. = \frac{1}{12}\ года\]

\[2)\ 2\ мес. = \frac{2}{12} = \frac{1}{6}\ года\]

\[3)\ \ 6\ мес. = \frac{6}{12} = \frac{1}{2}\ года\]

\[\boxed{\mathbf{5.\ }}\]

\[1)\ \frac{1}{2}\ кг = 1000\ :2 = 500\ г\]

\[2)\ \frac{1}{4}\ кг = 1000\ :4 = 250\ г\]

\[3)\ \frac{1}{8}\ кг = 1000\ :8 = 125\ г\]

\[4)\ \frac{1}{5}\ кг = 1000\ :5 = 200\ г\]