Решение:
1. 408 ⋅ 270 + 21008 : 808
- \( 408 \cdot 270 = 110160 \)
- \( 21008 : 808 = 26 \)
- \( 110160 + 26 = 110186 \)
2. 71370 : 234 + 695 ⋅ 50
- \( 71370 : 234 = 305 \)
- \( 695 \cdot 50 = 34750 \)
- \( 305 + 34750 = 35055 \)
3. 280084 : 28 - 125 ⋅ 8
- \( 280084 : 28 = 10003 \)
- \( 125 \cdot 8 = 1000 \)
- \( 10003 - 1000 = 9003 \)
4. (327 + 541350 : 450) : 3
- \( 541350 : 450 = 1203 \)
- \( 327 + 1203 = 1530 \)
- \( 1530 : 3 = 510 \)
5. (31460 + 1040) : (150 - 2400 : 120)
- \( 31460 + 1040 = 32500 \)
- \( 2400 : 120 = 20 \)
- \( 150 - 20 = 130 \)
- \( 32500 : 130 = 250 \)
6. (78213 - 75209) - 207 ⋅ 45 - 308
- \( 78213 - 75209 = 3004 \)
- \( 207 \cdot 45 = 9315 \)
- \( 3004 - 9315 - 308 = -6619 \)
7. (992341 : 269 + 780) - 325 : 5
- \( 992341 : 269 = 3690.8587... \)
- \( 3690.8587... + 780 = 4470.8587... \)
- \( 325 : 5 = 65 \)
- \( 4470.8587... - 65 = 4405.8587... \)
8. 434280 : 517 ⋅ 306 + 27449
- \( 434280 : 517 = 840 \)
- \( 840 \cdot 306 = 257040 \)
- \( 257040 + 27449 = 284489 \)
Проверь вычисления на калькуляторе.
Ответ: 110186; 35055; 9003; 510; 250; -6619; 4405.8587...; 284489.