Question

Сложите дроби
1/3 + 1/4
3/5 + 9/10
2/9 + 3/8
5/12 + 4/15
1/4 + 4/7 + 9/28

Answer 1

Ответ:

$\frac{1}{3} + \frac{1}{4} = \frac{4}{12} + \frac{3}{12} = \frac{7}{12} \\ \frac{3}{5} + \frac{9}{10} = \frac{6}{10} + \frac{9}{10} = \frac{15}{10} = \frac{3}{2} = 1 \frac{1}{2} \\ \frac{2}{9} + \frac{3}{8} = \frac{16}{72} + \frac{29}{72} = \frac{48}{72} = \frac{2}{3} \\ \frac{5}{12} + \frac{4}{15} = \frac{25}{60} + \frac{16}{60} = \frac{41}{60} \\ \frac{1}{4} + \frac{1}{7} + \frac{9}{28} = \frac{5}{7}$