а) 5,6 + 0,2 · (−12) = □; б) \(\frac{3}{7} : \frac{9}{14} + 2\frac{1}{6} = □\)

1. \(5,6+0,2\cdot(-12)=5,6-2,4=3,2\).
2. \(\frac{3}{7}:\frac{9}{14}+2\frac{1}{6}=\frac{3}{7}\cdot\frac{14}{9}+\frac{13}{6}=\frac{2}{3}+\frac{13}{6}=\frac{4}{6}+\frac{13}{6}=\frac{17}{6}=2\frac{5}{6}\).

Ответ: а) 3,2; б) \(2\frac{5}{6}\).