Question

реши уравнение a+4/21=4/7​

Answer 1

Ответ:

$a + \frac{4}{21} = \frac{4}{7} \\a = \frac{4}{7} - \frac{4}{21} \\ a = \frac{8}{21} \\ \\ \frac{8}{21} + \frac{4}{21} = \frac{4}{7}$