Решение:
a) \((-9.18 : 3.4 - 3.7) \cdot 2.1 + 2.04 = (-2.7 - 3.7) \cdot 2.1 + 2.04 = -6.4 \cdot 2.1 + 2.04 = -13.44 + 2.04 = -11.4\)
б) \(\frac{3}{7} \cdot (-0.54) - 1.56 \cdot \frac{3}{7} = \frac{3}{7} \cdot (-0.54 - 1.56) = \frac{3}{7} \cdot (-2.1) = \frac{3}{7} \cdot (-\frac{21}{10}) = -\frac{3 \cdot 21}{7 \cdot 10} = -\frac{3 \cdot 3}{1 \cdot 10} = -\frac{9}{10} = -0.9\)
**Ответ:**
a) -11.4
б) -0.9