Ответ:

  1. 50 + 5 = 55; 8 + 8 = 16; 6 + 5 = 11; 13 − 8 = 5; 9 + 2 = 11; 3 + 8 = 11.
  2. 4 + 7 = 11; 12 − 6 = 6; 11 − 8 = 3; 7 + 4 = 11; 8 + 5 = 13; 11 − 3 = 8.
  3. 14 − 7 = 7; 3 + 9 = 12; 11 − 3 = 8; 12 − 5 = 7; 6 + 6 = 12; 70 + 7 = 77.
  4. 8 + 7 = 15; 18 − 9 = 9; 15 − 8 = 7; 13 − 4 = 9; 13 − 8 = 5; 15 − 6 = 9.
  5. 13 − 8 = 5; 14 − 7 = 7; 9 + 2 = 11; 12 − 3 = 9; 7 + 7 = 14; 13 − 8 = 5.
  6. 9 + 5 = 14; 7 + 9 = 16; 17 − 8 = 9; 11 − 5 = 6; 7 + 5 = 12; 14 − 7 = 7.