3. 600-(80-25) 100:(172-18•4) 5•(30+170) - 160:(4•2) (3700+300-100): 100

3. Вычислим.

• $$600-(80-25) = 600 - 55 = 545$$
• $$100:(172-18 \cdot 4) = 100 : (172 - 72) = 100 : 100 = 1$$
• $$5 \cdot(30+170) - 160:(4 \cdot 2) = 5 \cdot 200 - 160 : 8 = 1000 - 20 = 980$$
• $$(3700+300-100): 100 = (4000 - 100) : 100 = 3900 : 100 = 39$$

Ответ: 545; 1; 980; 39.