10 из 10

Решение:

а) 360 : 6 ⋅ 5 - 450 : (25 ⋅ 2) - 70 ⋅ 6 : 3

1. 360 : 6 = 60
2. 60 ⋅ 5 = 300
3. 25 ⋅ 2 = 50
4. 450 : 50 = 9
5. 70 ⋅ 6 = 420
6. 420 : 3 = 140
7. 300 - 9 = 291
8. 291 - 140 = 151

Ответ: 151