Ответ:

  1. \(18.4+9.77=28.17\).
  2. \(15.7-3.48=12.22\).
  3. \(5.2\cdot0.25=1.3\).
  4. \(3.33:3.7=0.9\).
  5. \(\frac{2}{3}+\frac{5}{8}=\frac{16}{24}+\frac{15}{24}=\frac{31}{24}=1\frac{7}{24}\).
  6. \(8\frac{5}{12}-6\frac{7}{20}=2+\left(\frac{25}{60}-\frac{21}{60}\right)=2\frac{4}{60}=2\frac{1}{15}\).
  7. \(\frac{5}{6}\cdot\frac{3}{20}=\frac{15}{120}=\frac{1}{8}\).
  8. \(2\frac{5}{8}\cdot\frac{7}{32}=\frac{21}{8}\cdot\frac{7}{32}=\frac{147}{256}\).

Ответ: 1) 28,17; 2) 12,22; 3) 1,3; 4) 0,9; 5) 1 7/24; 6) 2 1/15; 7) 1/8; 8) 147/256.