2. Найдите значение выражения: a) -34 + 18 + (-20) + (-16) + 42, б) -4/7 ⋅ 5 3/8 ⋅ 7/4, в) -6/13 ⋅ 3.8 - 3.8 ⋅ 7/13.

Решение: a) -34 + 18 + (-20) + (-16) + 42 = -10, б) -4/7 ⋅ 43/8 ⋅ 7/4 = -43/8 = -5 3/8, в) -6/13 ⋅ 3.8 - 3.8 ⋅ 7/13 = -76/13.