0, 9 * 5 ^ 3 + 0, 8 * 9 ^ 2

To simplify the expression, follow the order of operations (PEMDAS/BODMAS):

1. Start with the exponentiation: 5 ^ 3 = 5 * 5 * 5 = 125 and 9 ^ 2 = 9 * 9 = 81.

Now the expression becomes:

0,9 * 125 + 0,8 * 81

2. Continue with the multiplication: 0,9 * 125 = 112,5 and 0,8 * 81 = 64,8.

Now the expression becomes:

112,5 + 64,8

3. Finally, add the two results together:

112,5 + 64,8 = 177,3

So, the simplified expression is 177,3.