Question

Помогите пожалуйста
$\frac{3}{12} + \frac{25}{30} \: \\ \ \: \\ \frac{10}{24} - \frac{21}{5} \\ \\ \ \ \frac{30}{54} + \frac{22}{30} \\ \\ \frac{28}{40} - \frac{10}{75}$
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Answer 1

$1) \frac{3}{12} + \frac{25}{30} = \frac{3}{12} + \frac{5}{6} = \frac{3 + 10}{12} = \frac{13}{12} = 1 \frac{1}{12} \\ 2) \frac{10}{24} - \frac{21}{54} = \frac{5}{12} - \frac{7}{18} = \frac{15 - 14}{36} = \frac{1}{36} \\ 3) \frac{30}{54} + \frac{22}{30} = \frac{5}{9} + \frac{11}{15} = \frac{25 + 33}{45} = \frac{58}{45} = 1 \frac{13}{45} \\ 4) \frac{28}{40 } - \frac{10}{75} = \frac{7}{10} - \frac{2}{15} = \frac{21 - 4}{30 } = \frac{17}{30}$