2,690*5/7-9,500:3+(56,3:8/7)

Let's solve the expression step by step:

1. Calculate \(2,690 \times 5\): \[ 2,690 \times 5 = 13,450 \]

2. Divide by 7: \[ \frac{13,450}{7} = 1,921.42857 \quad (\text{approximately}) \]

3. Calculate \(9,500 \div 3\): \[ 9,500 \div 3 = 3,166.66667 \quad (\text{approximately}) \]

4. Calculate \(56.3 \div 8\): \[ 56.3 \div 8 = 7.0375 \]

5. Now divide by 7: \[ \frac{7.0375}{7} = 1.004285714 \quad (\text{approximately}) \]

6. Combine all parts: Now substitute back into the main expression: \[ 1,921.42857 - 3,166.66667 + 1.004285714 \]

   • First perform \(1,921.42857 - 3,166.66667\): \[ 1,921.42857 - 3,166.66667 = -1,245.2381 \quad (\text{approximately}) \]

   • Now add \(1.004285714\): \[ -1,245.2381 + 1.004285714 = -1,244.233814286 \quad (\text{approximately}) \]

So the final result of the expression \(2,690 \times 5 \div 7 - 9,500 \div 3 + (56.3 \div 8 \div 7)\) is approximately: \[ \boxed{-1,244.23} \]