Ответ:

  1. (2 + 1/5) · 20 = 2 · 20 + 1/5 · 20 = 40 + 4 = 44.
  2. (3 + 1/6) · 4 = 3 · 4 + 1/6 · 4 = 12 + 2/3 = 12 2/3.
  3. (9 + 2/5) · 10 = 9 · 10 + 2/5 · 10 = 90 + 4 = 94.
  4. (8 + 3/4) · 8 = 8 · 8 + 3/4 · 8 = 64 + 6 = 70.
  5. (2 + 2/9) · 3 = 2 · 3 + 2/9 · 3 = 6 + 2/3 = 6 2/3.
  6. (4 + 5/6) · 4 = 4 · 4 + 5/6 · 4 = 16 + 3 1/3 = 19 1/3.