Решение:
a) $$-3.8 \cdot 1.5 = -5.7$$
б) $$-433.62 : (-5.4) = 80.3$$
в) $$-1\frac{1}{14} \cdot 2\frac{1}{3} = -\frac{15}{14} \cdot \frac{7}{3} = -\frac{15 \cdot 7}{14 \cdot 3} = -\frac{5 \cdot 1}{2 \cdot 1} = -\frac{5}{2} = -2.5$$
г) $$1\frac{1}{7} : (-2\frac{2}{7}) = \frac{8}{7} : (-\frac{16}{7}) = \frac{8}{7} \cdot (-\frac{7}{16}) = -\frac{8 \cdot 7}{7 \cdot 16} = -\frac{1 \cdot 1}{1 \cdot 2} = -\frac{1}{2} = -0.5$$
Ответы:
a) -5.7
б) 80.3
в) -2.5
г) -0.5