Ответ:

  1. \(0,7+\frac{1}{7}=\frac{7}{10}+\frac{1}{7}=\frac{49}{70}+\frac{10}{70}=\frac{59}{70}\).
  2. \(\frac{7}{16}-0,12=\frac{7}{16}-\frac{3}{25}=\frac{175}{400}-\frac{48}{400}=\frac{127}{400}\).
  3. \(4,85-2\frac{13}{24}=\frac{97}{20}-\frac{61}{24}=\frac{582}{120}-\frac{305}{120}=2\frac{37}{120}\).
  4. \(7\frac{8}{21}-6,375=\frac{155}{21}-\frac{51}{8}=\frac{1240}{168}-\frac{1071}{168}=1\frac{1}{168}\).