1. Вычислить: a) \(\frac{2}{5} + \frac{1}{6}\); б) \(5\frac{5}{7} : 3\); в) \(3.2 - 0.15\); г) \(34 \cdot 2.35\); д) \(1.25 - \frac{2}{5}\); е) \(\frac{2}{3} \cdot 0.3\); ж) \(-6 + 4\); з) \(-9 : (-0.3)\).

a) \(\frac{2}{5} + \frac{1}{6} = \frac{12}{30} + \frac{5}{30} = \frac{17}{30}\) б) \(5\frac{5}{7} : 3 = \frac{40}{7} : 3 = \frac{40}{7} \cdot \frac{1}{3} = \frac{40}{21} = 1\frac{19}{21}\) в) \(3.2 - 0.15 = 3.05\) г) \(34 \cdot 2.35 = 79.9\) д) \(1.25 - \frac{2}{5} = 1.25 - 0.4 = 0.85\) е) \(\frac{2}{3} \cdot 0.3 = \frac{2}{3} \cdot \frac{3}{10} = \frac{6}{30} = \frac{1}{5} = 0.2\) ж) \(-6 + 4 = -2\) з) \(-9 : (-0.3) = -9 : (-\frac{3}{10}) = -9 \cdot (-\frac{10}{3}) = 3 \cdot 10 = 30\)