a) $$2 \cdot 14 + 6 \cdot 2 = 2 \cdot (14 + 6) = 2 \cdot 20 = 40$$
б) $$18 \cdot 4 - 8 \cdot 4 = 4 \cdot (18 - 8) = 4 \cdot 10 = 40$$
в) $$17 \cdot 6 + 4 \cdot 17 = 17 \cdot (6 + 4) = 17 \cdot 10 = 170$$
г) $$22 \cdot 3 - 3 \cdot 2 = 3 \cdot (22 - 2) = 3 \cdot 20 = 60$$
д) $$1.5 \cdot 14 - 4 \cdot 1.5 = 1.5 \cdot (14 - 4) = 1.5 \cdot 10 = 15$$
e) $$0.8 \cdot 0.5 + 0.8 \cdot 0.3 = 0.8 \cdot (0.5 + 0.3) = 0.8 \cdot 0.8 = 0.64$$
ж) $$18 \cdot 1.2 + 2 \cdot 1.2 = 1.2 \cdot (18 + 2) = 1.2 \cdot 20 = 24$$
з) $$\frac{2}{5} \cdot \frac{4}{9} + \frac{2}{5} \cdot \frac{5}{9} = \frac{2}{5} \cdot (\frac{4}{9} + \frac{5}{9}) = \frac{2}{5} \cdot \frac{9}{9} = \frac{2}{5} \cdot 1 = \frac{2}{5}$$