18:(27:3)+88= 84-8(11-8)= 66+4-(29-20)+3= 35-53+10= 39-12:2= 57+20-15:3=

Первый пример.

18 : (27 : 3) + 88 = 90;

27 / 3 = 9;

18 / 9 = 2;

2 + 88 = 90.

Второй пример.

84 - 8 * (11 - 8) = 60;

11 - 8 = 3;

8 * 3 = 24;

84 - 24 = 60.

3-ий пример.

66 + 4 - (29 - 20) + 3 = 64;

29 - 20 = 9;

66 + 4 = 70;

70 - 9 = 61;

61 + 3 = 64.

4-ый пример.

35 - 5 * 3 + 10 = 30;

5 * 3 = 15;

35 - 15 = 20;

20 + 10 = 30.

5-ый пример.

3 * 9 - 12 : 2 = 21;

3 * 9 = 27;

12 / 2 = 6;

27 - 6 = 21.

6-ой пример.

57 + 20 - 15 : 3 = 72;

57 + 20 = 77;

15 / 3 = 5;

77 - 5 = 72.