First, we simplify the expression inside the parentheses:

2, 6 ÷ 4,5 = 2, 6 x (1/4,5) = 2, 6 x 0,22 = 0,572

Next, we simplify the expression inside the other set of parentheses:

1/2 + 4,5 = 2/4 + 9/2 = 5/4 + 18/4 = 23/4 = 5,75

Now, we can divide the two simplified expressions:

0,572 ÷ 5,75 = 0,0996

Therefore, ( 2, 6 - 1 / 5 ) ÷ ( 1 / 2 + 4,5 ) = 0,0996.