Выполните действия:
1) $8 + \frac{4}{21}$;
2) $5\frac{16}{19} + 3\frac{5}{19}$;
3) $7\frac{7}{16} - 3\frac{3}{16}$;
4) $10\frac{12}{17} + 5\frac{4}{17} - 3\frac{3}{17}$.
$8 + \frac{4}{21} = 8\frac{4}{21}$
$5\frac{16}{19} + 3\frac{5}{19} = (5 + 3) + (\frac{16}{19} + \frac{5}{19}) = 8 + \frac{21}{19} = 8 + 1\frac{2}{19} = 9\frac{2}{19}$
$7\frac{7}{16} - 3\frac{3}{16} = (7 - 3) + (\frac{7}{16} - \frac{3}{16}) = 4 + \frac{4}{16} = 4\frac{4}{16}$
$10\frac{12}{17} + 5\frac{4}{17} - 3\frac{3}{17} = (10 + 5 - 3) + (\frac{12}{17} + \frac{4}{17} - \frac{3}{17}) = 12 + \frac{13}{17} = 12\frac{13}{17}$
Пожауйста, оцените решение
