Final answer:
The expressions are already in their simplest form.
Step-by-step explanation:
To simplify the expression √3 - √2, we combine like terms. However, we cannot combine these radicals because they are not like terms. So, the expression √3 - √2 is already in its simplest form.
In the expressions 2√6 and 2√5, the radicals cannot be combined because they have different radicands. Therefore, the expressions 2√6 and 2√5 are already in their simplest form.
Similarly, the expressions (2√6)/5 and (2√5)/5 are also in their simplest form because the radicals cannot be combined with the integers in the denominators.