Ответ:

  1. а) \(\frac{1}{3}-0,45=\frac{1}{3}-\frac{9}{20}=\frac{20-27}{60}=-\frac{7}{60}\).

    б) \(-10,5-6\frac{5}{6}=-\frac{21}{2}-\frac{41}{6}=-\frac{63}{6}-\frac{41}{6}=-\frac{104}{6}=-\frac{52}{3}=-17\frac{1}{3}\).

    в) \(\frac{3}{14}\cdot\left(-1\frac{5}{16}\right)=\frac{3}{14}\cdot\left(-\frac{21}{16}\right)=-\frac{63}{224}=-\frac{9}{32}\).

    г) \(\left(-4\frac{2}{7}\right):(-2,1)=-\frac{30}{7}:\left(-\frac{21}{10}\right)=\frac{30}{7}\cdot\frac{10}{21}=\frac{100}{49}=2\frac{2}{49}\).

Ответ: а) \(-\frac{7}{60}\); б) \(-17\frac{1}{3}\); в) \(-\frac{9}{32}\); г) \(2\frac{2}{49}\).