6.

Решение:

1. 408 ⋅ 270 + 21 008 : 808
   \( 408 \cdot 270 = 109080 \)
   \( 21008 : 808 = 26 \)
   \( 109080 + 26 = 109106 \)
2. 71 370 : 234 + 695 ⋅ 50
   \( 71370 : 234 = 305 \)
   \( 695 \cdot 50 = 34750 \)
   \( 305 + 34750 = 35055 \)
3. 280 084 : 28 – 125 ⋅ 8
   \( 280084 : 28 = 10003 \)
   \( 125 \cdot 8 = 1000 \)
   \( 10003 - 1000 = 9003 \)
4. (327 + 541 350 : 450) : 3
   \( 541350 : 450 = 1203 \)
   \( 327 + 1203 = 1530 \)
   \( 1530 : 3 = 510 \)
5. (31 460 + 1 040) : (150 – 2 400 : 120)
   \( 31460 + 1040 = 32500 \)
   \( 2400 : 120 = 20 \)
   \( 150 - 20 = 130 \)
   \( 32500 : 130 = 250 \)
6. (78 213 – 75 209) ⋅ 207 – 45 ⋅ 308
   \( 78213 - 75209 = 3004 \)
   \( 3004 \cdot 207 = 621828 \)
   \( 45 \cdot 308 = 13860 \)
   \( 621828 - 13860 = 607968 \)
7. (992 341 : 269 + 780) – 325 : 5
   \( 992341 : 269 = 3690 \)
   \( 3690 + 780 = 4470 \)
   \( 325 : 5 = 65 \)
   \( 4470 - 65 = 4405 \)
8. 434 280 : 517 ⋅ 306 + 27 449
   \( 434280 : 517 = 840 \)
   \( 840 \cdot 306 = 257040 \)
   \( 257040 + 27449 = 284489 \)

Ответ:

• 109 106
• 35 055
• 9 003
• 510
• 250
• 607 968
• 4 405
• 284 489