Частина 1. Номер 9

54 + 1 = 55;

29 + 1 = 30;

20 + 10 = 30;

90 – 70 = 20;

48 – 1 = 47;

43 – 3 = 40;

72 – 10 = 62;

26 + 70 = 96;

36 – 6 = 30;

40 + 6 = 46;

58 – 8 = 50;

75 – 5 = 70.