Question

Решить пример с дробями 1-2/7=

Answer 1

$1-\frac{2}{7} \\\frac{7-2}{7} \\\frac{5}{7}$

Answer 2

$\tt\displaystyle\ 1 - \frac {2}{7} = \frac {7}{7} - \frac {2}{7} = \frac {5}{7}$

или

$\tt\displaystyle\ \frac{1-2}{7} = \frac{1}{7}$