The problem asks to calculate the value of the expression $8.5 - (3.4 + 1.3)$.

1. Problem Description

The problem asks to calculate the value of the expression $8.5 - (3.4 + 1.3)$.

2. Solution Steps

First, we need to calculate the sum within the parentheses:

$3.4 + 1.3 = 4.7$

Now we substitute this value back into the original expression:

$8.5 - 4.7$

Subtract $4.7$ from $8.5$:

$8.5 - 4.7 = 3.8$

3. Final Answer

The final answer is 3.8.