Проверим каждое неравенство.
- $$0.2 \cdot (-0.3) \cdot 0.5 < 0.26 : (-13)$$
$$0.2 \cdot (-0.3) \cdot 0.5 = -0.03$$
$$0.26 : (-13) = -0.02$$
$$-0.03 < -0.02$$ - верно
- $$32.16 : 1.6 < 6.8 : \frac{1}{3}$$
$$32.16 : 1.6 = 20.1$$
$$6.8 : \frac{1}{3} = 6.8 \cdot 3 = 20.4$$
$$20.1 < 20.4$$ - верно
- $$-1.24 \cdot 7.5 > 12 : (-1.5)$$
$$-1.24 \cdot 7.5 = -9.3$$
$$12 : (-1.5) = -8$$
$$-9.3 > -8$$ - неверно
- $$\frac{1}{3} + \frac{1}{4} - \frac{1}{2} > \frac{2}{7} \cdot (-3.5)$$
$$\frac{1}{3} + \frac{1}{4} - \frac{1}{2} = \frac{4}{12} + \frac{3}{12} - \frac{6}{12} = \frac{1}{12}$$
$$\frac{2}{7} \cdot (-3.5) = \frac{2}{7} \cdot (-\frac{7}{2}) = -1$$
$$\frac{1}{12} > -1$$ - верно
Отмечены верные неравенства: 1, 2, 4
Ответ: 1, 2, 4