ГДЗ по математике 5 класс Мерзляк Задание 775

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\[1)\ 8 + \frac{4}{21} = 8\frac{4}{21}\]

\[2)\ 5\frac{16}{19} + 3\frac{5}{19} =\]

\[= (5 + 3) + \left( \frac{16}{19} + \frac{5}{19} \right) =\]

\[= 8 + \frac{21}{19} = 8 + 1\frac{2}{19} = 9\frac{2}{19}\]

\[3)\ 7\frac{7}{16} - 3\frac{3}{16} =\]

\[= (7 - 3) + \left( \frac{7}{16} - \frac{3}{16} \right) =\]

\[= 4 + \frac{4}{16} = 4\frac{4}{16}\]

\[4)\ 10\ \frac{12}{17} + 5\frac{4}{17} - 3\frac{3}{17} =\]

\[= 12 + \frac{13}{17} = 12\frac{13}{17}\]