Question

Вычислить
а) 2 5/6-7/10
б) 1 1/6:2 4/7
в) -7+(-5)

Answer 1

а)$2 \frac{5}{6}- \frac{7}{10}=2\frac{25}{30}- \frac{21}{30}=2 \frac{4}{30}=2 \frac{2}{15}$
б)$1\frac{1}{6}:2 \frac{4}{7}=\frac{7}{6}: \frac{18}{7}=\frac{7}{6}\cdot \frac{7}{18}= \frac{49}{108}$
в)(-7)+(-5)=-12