Question

Решите пример который последний

Answer 1

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Answer 2

$\frac{5}{7} \times \frac{21}{20} - \frac{5}{7} \times \frac{7}{30} + \frac{16}{21} \times \frac{7}{8} = \frac{3}{4} - \frac{1}{6} + \frac{2}{3} = \frac{9 - 2 + 8}{12} = \frac{11}{12} = \frac{15}{12}$