# In this Section:

In this section, we learn how to simplify complex rational expressions. In pre-algebra we learned that a complex
fraction is a fraction that contains a fraction in its numerator, denominator, or both. These also occur when we deal with rational expressions. There are two main
methods to simplify this type of problem. In the first case, we simplify the numerator and denominator of the complex rational expression separately, then perform
the main division. Alternatively, we can multiply the numerator and denominator of the complex fraction by the LCD of all denominators involved. Generally, the LCD
method is faster, especially on more complex problems.