ГДЗ по алгебре 9 класс Макарычев ФГОС Задание 32

\[\boxed{\text{33.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]

\[\textbf{а)}\ 12\frac{2}{5} - 2\frac{2}{7}\ :1\frac{19}{21} =\]

\[= 12\frac{2}{5} - \frac{16}{7}\ :\frac{40}{21} =\]

\[= 12\frac{2}{5} - \frac{16}{7} \cdot \frac{21}{40} = 12\frac{2}{5} - \frac{12}{10} =\]

\[= 12,4 - 1,2 = 11,2\]

\[\textbf{б)}\ \left( 12\frac{2^{\backslash 7}}{5} - 2\frac{2^{\backslash 5}}{7} \right)\ :1\frac{19}{21} =\]

\[= \left( 12\frac{14}{35} - 2\frac{10}{35} \right)\ :\frac{40}{21} =\]

\[= 10\frac{4}{35} \cdot \frac{21}{40} = \frac{354}{35} \cdot \frac{21}{40} =\]

\[= \frac{177 \cdot 3}{5 \cdot 20} = \frac{531}{100} = 5,31\]