Question

Обчисли
4/7+2/7
7/9-2/9
4 2/5+ 2 3/5
1 - 2/7

Answer 1

$\frac{4}{7} + \frac{2}{7} = \frac{4 + 2}{7} = \frac{6}{7}$

$\frac{7}{9} - \frac{2}{9} = \frac{7 - 2}{9} = \frac{5}{9}$

$4 \frac{2}{5} + 2 \frac{3}{5} = 6 \frac{5}{5} = 7$

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