The problem you've uploaded contains several mathematical tasks related to square roots. Here's a breakdown of the questions:

1. Task 1: Calculate the value of the expression $A = \frac{\sqrt{x}}{x-2}$ when $x = 25$.

2. Task 2: Prove that $B = \frac{\sqrt{x}}{x+3}$ holds.

3. Task 3: Consider the expression $P = A \cdot B$. Find all the values of $x$ for which $P = \frac{4x+3}{\sqrt{x-2}}$.

Would you like me to work through the steps to solve these problems? Feel free to let me know if you need any further clarification!