You provided the following expression:

$\frac{1}{1 + \sqrt{2} + \sqrt{3}}$

To simplify or work with this expression, we typically rationalize the denominator to eliminate the square roots. This can be done by multiplying both the numerator and denominator by the conjugate of the denominator. The conjugate of $1 + \sqrt{2} + \sqrt{3}$ is $1 - \sqrt{2} - \sqrt{3}$.

Let's rationalize the denominator by multiplying the entire expression by:

$\frac{1 - \sqrt{2} - \sqrt{3}}{1 - \sqrt{2} - \sqrt{3}}$

The new expression becomes:

$\frac{1(1 - \sqrt{2} - \sqrt{3})}{(1 + \sqrt{2} + \sqrt{3})(1 - \sqrt{2} - \sqrt{3})}$

I'll now perform the calculations for the numerator and denominator.After performing the operations, it turns out that the expression simplifies back to the original form:

$\frac{1}{1 + \sqrt{2} + \sqrt{3}}$

The denominator does not simplify easily through rationalization, and the expression is already in its simplest form.

Would you like further clarification or a different approach? Here are some related questions that might help:

1. What is the numerical approximation of this expression?
2. Can we evaluate the result to a decimal?
3. How do we rationalize more complex denominators?
4. What is the conjugate and how does it help in rationalizing?
5. Are there alternative methods for simplifying such expressions?

Tip: When dealing with square roots, rationalizing the denominator helps remove the radicals for easier computation.