32+9÷(19-16)-25= 3×3×7-(7×2-1)+28÷4= 420÷7×8-24÷6= 16+560÷7-21= 3×9-21÷3-(16-10)+2= (28÷7)+(36÷9+2×11)×2-20=

Первый пример.

32 + 9 / (19 - 16) - 25 = 10;

19 - 16 = 3;

9 / 3 = 3;

32 + 3 = 35;

35 - 25 = 10.

Второй пример.

3 * 3 * 7 - (7 * 2 - 1) + 28 / 4 = 57;

3 * 3 = 9;

9 * 7 = 63;

7 * 2 = 14;

14 - 1 = 13;

63 - 13 = 50;

28 / 4  = 7;

50 + 7 = 57.

Третий пример.

420 / 7 * 8 - 24 / 6 = 476;

420 / 7 = 60;

60 * 8 = 480;

24 / 6 = 4;

480 - 4 = 476.

Четвертый пример.

16 + 560 / 7 - 21 = 75;

560 / 7 = 80;

16 + 80 = 96;

96 - 21 = 75.

Пятый пример.

3 * 9 - 21 / 3 - (16 - 10) + 2 = 16;

3 * 9 = 27;

21 / 3 = 7;

27 - 7 = 20;

16 - 10 = 6;

20 - 6 = 14;

14 + 2 = 16.

Шестой пример.

(28 / 7) + (36 / 9 + 2 * 11) * 2 - 20 = 36;

28 / 7 = 4;

36 / 9 = 4;

2 * 11 = 22;

4 + 22 = 26;

26 * 2 = 52;

4 + 52 = 56;

56 - 20 = 36.