The image you uploaded contains a signal processing question in Vietnamese. The question involves various transformations of a signal $x(t)$, including scaling, shifting, and time reversal, and asks which of the options provided matches a series of operations on the signal.

The operations include:

1. Scaling the signal by a factor $K$.
2. Shifting the signal by $a$ seconds forward and backward.
3. Time reversal (flipping the signal around the $t=0$ axis).
4. Various combinations of these transformations.

The problem asks you to identify the result after applying a series of these transformations to the initial signal $x(t)$.

Steps to solve:

You need to apply the transformations step by step. For example:

• Scaling the signal: $x(t) \rightarrow x(Kt)$ or $x(t/K)$
• Shifting the signal: $x(t) \rightarrow x(t - a)$
• Time reversal: $x(t) \rightarrow x(-t)$

After applying these operations, you will match the result with the options listed as (a), (b), (c), etc.

Would you like me to solve a specific part of this question, or guide you through the solution in more detail?

Relative Questions:

1. What is the general effect of scaling a signal by a factor $K$?
2. How does time-shifting by $a$ seconds affect the signal mathematically?
3. Can you explain the result of time reversal on a signal?
4. How do multiple transformations (scaling, shifting, reversing) combine in a single expression?
5. What are common mistakes when combining signal transformations?

Tip:

Always apply the transformations in the correct order as specified in the problem, since the order of operations matters in signal processing.