36sqrt39/9sqrt13

To simplifying the expression 36√39 / 9√13, we first simplify the numbers under the square roots:

√39 = √(13 * 3) = √13 * √3 = 3√13

√13 = √13

Now the expression becomes:

36(3√13) / 9√13

= 108√13 / 9√13

= 12

Therefore, 36√39 / 9√13 simplifies to 12.