Выполните действия:
1) $5\frac{19}{43} + 7\frac{24}{43}$;
2) $7\frac{13}{30} - 2\frac{5}{30}$;
3) $5 - 2\frac{7}{24}$;
4) $9\frac{5}{17} - 4\frac{12}{17}$.
$5\frac{19}{43} + 7\frac{24}{43} = (5 + 7) + (\frac{19}{43} + \frac{24}{43}) = 12 + \frac{43}{43} = 12 + 1 = 13$
$7\frac{13}{30} - 2\frac{5}{30} = (7 - 2) + (\frac{13}{30} - \frac{5}{30}) = 5 + \frac{8}{30} = 5\frac{8}{30} = 5\frac{4}{15}$
$5 - 2\frac{7}{24} = 4\frac{24}{24} - 2\frac{7}{24} = (4 - 2) + (\frac{24}{24} - \frac{7}{24}) = 2 + \frac{17}{24} = 2\frac{17}{24}$
$9\frac{5}{17} - 4\frac{12}{17} = 8\frac{22}{17} - 4\frac{12}{17} = (8 - 4) + (\frac{22}{17} - \frac{12}{17}) = 4 + \frac{10}{17} = 4\frac{10}{17}$
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