(8.640:8+5.250:5-130)•3

Let's solve the expression step by step.

First, we need to calculate the divisions:

1. \(8.640 \div 8 = 1.080\)
2. \(5.250 \div 5 = 1.050\)

Now, substitute these results back into the expression:

\[(1.080 + 1.050 - 130) \cdot 3\]

Next, combine the results within the parentheses:

\[ 1.080 + 1.050 = 2.130 \]

Now subtract 130 from 2.130:

\[ 2.130 - 130 = -127.870 \]

Finally, multiply by 3:

\[ -127.870 \cdot 3 = -383.610 \]

Thus, the final result is:

\(-383.610\)