39+42:7-15= 100-8*8= 9*9-8*5= 83-72:9+25= 91-7*7= 9*(9-8)*5= 41+56:8-16 = 82-5*5= 36:6*8-19=

1-ый пример.

39 + 42 : 7 - 15 = 30;

42 / 7 = 6;

39 + 6 = 45;

45 - 15 = 30.

2-ой пример.

100 - 8 * 8 = 36;

8 * 8 = 64;

100 - 64 = 36.

3-ий пример.

9 * 9 - 8 * 5 = 41;

9 * 9 = 81;

8 * 5 = 40;

81 - 40 = 41.

4-ый пример.

83 - 72 : 9 + 25 = 100;

72 / 9 = 8;

83 - 8 = 75;

75 + 25 = 100.

Пятый пример.

91 - 7 * 7 = 42;

7 * 7 = 49;

91 - 49 = 42.

6-ой пример.

9 * (9 - 8) * 5 = 45;

9 - 8 = 1;

9 * 1 = 9;

9 * 5 = 45;

Седьмой пример.

41 + 56 : 8 - 16 = 32;

56 / 8 = 7;

41 + 7 = 48;

48 - 16 = 32.

Восьмой пример.

82 - 5 * 5 = 57;

5 * 5 = 25;

82 - 25 = 57.

Девятый пример.

36 : 6 * 8 - 19 = 29;

36 / 6 = 6;

6 * 8 = 48;

48 - 19 = 29.