(8.640:8+5.250:5-130)•3

Let's break down the expression step by step:

1. Calculate \(8.640 \div 8\): \[ 8.640 \div 8 = 1.08 \]

2. Calculate \(5.250 \div 5\): \[ 5.250 \div 5 = 1.05 \]

3. Now substitute these results back into the expression: \[ (1.08 + 1.05 - 130) \]

4. Add \(1.08\) and \(1.05\): \[ 1.08 + 1.05 = 2.13 \]

5. Now subtract \(130\): \[ 2.13 - 130 = -127.87 \]

6. Finally, multiply by \(3\): \[ (-127.87) \cdot 3 = -383.61 \]

Thus, the final result is \(-383.61\).