26+6*7-45:5= 6*4:3:2*7= 9*6-3*6+18-27:3= 48:6:2-6:3*2= (34+19)-3-(15+18)+(28+29) (59+27)-(20-9)-30+(23+18)=

1-ый пример.

26 + 6 * 7 - 45 : 5 = 59;

6 * 7 = 42;

26 + 42 = 68;

45 / 5 = 9;

68 - 9 = 59.

Второй пример. 

6 * 4 : 3 : 2 * 7= 28;

6 * 4 = 24;

24 / 3 = 8;

8 / 2 = 4;

4 * 7 = 28.

3-ий пример.

9 * 6 - 3 * 6 + 18 - 27 : 3 = 45;

9 * 6 = 54;

3 * 6 = 18;

54 - 18 = 36;

36 + 18 = 54;

27 / 3 = 9;

54 - 9 = 45.

Четвертый пример.

48 : 6 : 2 - 6 : 3 * 2 = 0;

48 / 6 = 8;

8 / 2 = 4;

6 / 3 = 2;

2 * 2 = 4;

4 - 4 = 0.

5-ый пример.

(34 + 19) - 3 - (15 + 18) + (28 + 29) = 74;

34 + 19 = 53;

53 - 3 = 50;

15 + 18 = 33;

50 - 33 = 17;

28 + 29 = 57;

17 + 57 = 74.

6-ой пример.

(59 + 27) - (20 - 9) - 30 + (23 + 18) = 86;

59 + 27 = 86;

20 - 9 = 11;

86 - 11 = 75;

75 - 30 = 45;

23 + 18 = 41;

45 + 41 = 86.