Ответ:

  1. 0,(6) + 0,(4) = 2/3 + 4/9 = 6/9 + 4/9 = 10/9 = 1 1/9.
  2. 5,(8) − 2,(3) = 53/9 − 7/3 = 53/9 − 21/9 = 32/9 = 3 5/9.
  3. 0,(4) · 0,2(3) = 4/9 · 7/30 = 28/270 = 14/135.
  4. 8,(2) : 4,(1) = 74/9 : 37/9 = 74/9 · 9/37 = 2.

Ответ: 1 1/9; 3 5/9; 14/135; 2.