Question

8-4,2:(2 5/14-1 4/21)

Answer 1

Пошаговое объяснение:

$8 - 4.2 \div (2 \frac{5}{14} - 1 \frac{4}{21}) = 8 - 4 \frac{1}{5} \div (2 \frac{15}{42} - 1 \frac{8}{42}) = 8 - \frac{21}{5} \div 1 \frac{7}{42} = 8 - \frac{21}{5} \div \frac{7}{6} = 8 - \frac{21}{5} \times \frac{6}{7} = 8 - \frac{18}{5} = 8 - 3.6 = 4.4$