Ответ:

  1. \(|−\frac{1}{6}|+|−\frac{1}{3}|=\frac{1}{6}+\frac{1}{3}=\frac{1}{6}+\frac{2}{6}=\frac{3}{6}=\frac{1}{2}\).
  2. \(|−\frac{7}{8}|−|\frac{7}{8}|=\frac{7}{8}−\frac{7}{8}=0\).
  3. \(|−1,2|\cdot|−0,5|=1,2\cdot0,5=0,6\).
  4. \(|\frac{7}{16}|:|\frac{21}{24}|=\frac{7}{16}:\frac{21}{24}=\frac{7}{16}\cdot\frac{24}{21}=\frac{1}{2}\).

Ответ: а) \(\frac{1}{2}\); б) 0; в) 0,6; г) \(\frac{1}{2}\).