3) Дроби а) -2/7 * 4/5 = б) -4/9 * (-3) = в) 4 4/5 + 7/10 = г) 6 + 3/7 =

Дроби

Давай выполним действия с дробями:

1. a) -\(\frac{2}{7}\) \(\times\) \(\frac{4}{5}\) = -\(\frac{2 \times 4}{7 \times 5}\) = -\(\frac{8}{35}\)

2. б) -\(\frac{4}{9}\) \(\times\) (-3) = \(\frac{4}{9}\) \(\times\) 3 = \(\frac{4 \times 3}{9}\) = \(\frac{12}{9}\) = \(\frac{4}{3}\) = 1\(\frac{1}{3}\)

3. в) 4\(\frac{4}{5}\) + \(\frac{7}{10}\)

   Преобразуем смешанную дробь в неправильную: 4\(\frac{4}{5}\) = \(\frac{4 \times 5 + 4}{5}\) = \(\frac{24}{5}\)

   Приведем дроби к общему знаменателю (10):

   \(\frac{24}{5}\) = \(\frac{24 \times 2}{5 \times 2}\) = \(\frac{48}{10}\)

   Теперь сложим:

   \(\frac{48}{10}\) + \(\frac{7}{10}\) = \(\frac{48 + 7}{10}\) = \(\frac{55}{10}\) = 5\(\frac{5}{10}\) = 5\(\frac{1}{2}\)

4. г) 6 + \(\frac{3}{7}\) = 6\(\frac{3}{7}\)