0,5√121+3√0,81

To solve this expression, one needs to simplify both terms separately and then add the results.

Let's start with the first term, 0.5√121. The square root of 121 is 11, so we can substitute it to get:

0.5√121 = 0.5 * 11 = 5.5

Now let's simplify the second term, 3√0.81. The square root of 0.81 is 0.9, so we have:

3√0.81 = 3 * 0.9 = 2.7

Finally, we add the results of both terms:

5.5 + 2.7 = 8.2

Therefore, the simplified expression becomes 8.2.