Ответ:

  1. \(\frac{2}{25}\times 0,35=0,08\times 0,35=0,028\).
  2. \(12,5\times 3\frac{7}{28}=12,5\times 3,25=40,625\).
  3. \(16\frac{1}{20}\times 6,5=16,05\times 6,5=104,325\).
  4. \(1,23\times\frac{3}{5}=1,23\times 0,6=0,738\).

Ответ: \(\frac{2}{25}\times 0,35\) — 0,028; \(12,5\times 3\frac{7}{28}\) — 40,625; \(16\frac{1}{20}\times 6,5\) — 104,325; \(1,23\times\frac{3}{5}\) — 0,738.