Question

3 1/5-4/21х+5/7 = если х равен 0,7

Answer 1

$3 \frac{1}{5} - \frac{4}{21} \times 0.7 + \frac{5}{7} = \frac{26}{7} \\ 1) \frac{4}{21} \times \frac{7}{10} = \frac{2}{10} \\ 2) \frac{16}{5} - \frac{2}{10} = \frac{32 - 2}{10} = \frac{30}{10} = 3 \\ 3) \frac{3}{1} + \frac{5}{7} = \frac{21 + 5}{7} = \frac{26}{7}$