To simplify the expressions given in your question, let's look at each one separately.

1. **Simplifying \( \frac{5}{4} m^2 \)**:
- This expression is already in its simplest form. It represents \( 5/4 \) times the unit \( m^2 \) (square meters).

2. **Simplifying \( \frac{25}{4} m^2 \)**:
- Similar to the first expression, this is also in its simplest form. It represents \( 25/4 \) times the unit \( m^2 \) (square meters).

If you need any further assistance or clarification regarding these expressions or any related topics, feel free to ask!