Question

585.выполните действия:​

Answer 1

Ответ:

1)

$\frac{5}{6} \times \frac{9}{15} - \frac{5}{12} \times \frac{4}{15} = \frac{5 \times 9}{6 \times 15} - \frac{5 \times 4}{12 \times 15} = \frac{3}{6} - \frac{1}{6} = \frac{2}{6}$

2)

$\frac{7 \times 9}{18 \times 14} + \frac{1 \times 6}{3 \times 7} = \frac{1}{4} + \frac{2}{7} = \frac{7}{28} + \frac{8}{28} = \frac{15}{28}$

3)

$\frac{9 \times 2}{20 \times 3} + \frac{5 \times 7}{14 \times 25} = \frac{3}{10} + \frac{1}{10} = \frac{4}{10}$