600-(80-25)= ,100:(172-184)=5(30+170)-160:(42)=(3700+300-100):100=

1-ый пример.

600 -(80 - 25) = 545;

80 - 25 = 55;

600 - 55 = 545.

2-ой пример.

100 : (172 - 18 * 4) = 1;

18 * 4 = 72;

172 - 72 = 100;

100 / 100 = 1.

3-ий пример.

5 * (30 + 170) - 160 : (4 * 2) = 980;

30 + 170 = 200;

5 * 200 = 1000;

4 * 2 = 8;

160 / 8 = 20;

1000 - 20 = 980.

4-ый пример.

(3700 + 300 - 100) : 100 = 39;

3700 + 300 = 4000;

4000 - 100 = 3900;

3900 / 100 = 39.