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Решите задачу:

$1) \: \: \: \frac{4}{15} + \frac{3}{4} = \frac{4 \times 4 + 3 \times 15}{60} = \frac{16 + 45}{60} = \frac{61}{60} = 1 \frac{1}{60} \\ 2) \: \: \: \frac{5}{6} - \frac{9}{14} = \frac{7 \times 5 - 3 \times 9}{42} = \frac{35 - 27}{42} = \frac{ 8 }{42} = \frac{4}{21}$
$3) \: \: \: 4 \frac{4}{7} + 6 \frac{1}{4} = 4 + 6 + \frac{4 \times 4 + 7}{28} = 10 \frac{16 + 7}{28} = 10 \frac{23}{28} \\ 4) \: \: \: 5 \frac{7}{8} - 3 \frac{5}{6} = 5 - 3 + \frac{7 \times 3 - 5 \times 4}{24} = 2 \frac{21 - 20}{24} = 2 \frac{1}{24}$