**Решение:**
1. \[(1250 - 1125) \cdot 3 + 125 \cdot 100 = 125 \cdot 3 + 12500 = 375 + 12500 = 12875\]
2. \[1250 + 7500 : 5 + 2530 = 1250 + 1500 + 2530 = 5280\]
3. \[(10500 - 7050) : 10 + 75 = 3450 : 10 + 75 = 345 + 75 = 420\]
4. \[20450 - 20405 + 2145 = 45 + 2145 = 2190\]
5. \[38000 + 95 - 200 - 3700 = 38095 - 200 - 3700 = 37895 - 3700 = 34195\]
6. \[5700 \cdot (32 + 50 - 4 \cdot 400) = 5700 \cdot (82 - 1600) = 5700 \cdot (-1518) = -8652600\]
**Ответы:**
1. 12875
2. 5280
3. 420
4. 2190
5. 34195
6. -8652600
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