Question

7. Решите уравнения: 1) x + 4/21=2/3 + 2/7​

Answer 1

Ответ:

Пошаговое объяснение:

х+4/21=2/3+2/7

x+4/21=14/21+6/21

x+4/21=20/21

X=20/21-4/21

x=16/21

Answer 2

Ответ:

$\frac{16}{21}$

Пошаговое объяснение:

$x + \frac{4}{21} = \frac{2}{3} + \frac{2}{7} \\\\x + \frac{4}{21} = \frac{14 + 6}{21} \\\\x + \frac{4}{21} = \frac{20}{21}\\\\x = \frac{20}{21} - \frac{4}{21}\\\\x = \frac{16}{21}$

проверка

$\frac{6}{21} + \frac{4}{21} = \frac{2}{3} + \frac{2}{7} \\\\ \frac{20}{21} = \frac{20}{21}$