Denominator Rationalization
In order to rationalize the denominator of the expression 1/(√2 + √3 + √10), we need to eliminate the square roots in the denominator. This process involves multiplying both the numerator and denominator by a suitable expression that will help get rid of the square roots.

Step 1: Multiply by the Conjugate
To rationalize the denominator, we multiply both the numerator and denominator by the conjugate of the denominator. In this case, we will multiply by (√2 - √3 + √10).
1/(√2 + √3 + √10) * (√2 - √3 + √10)/(√2 - √3 + √10)

Step 2: Simplify the Expression
By multiplying the numerator and denominator, we get:
(1 * (√2 - √3 + √10))/((√2 + √3 + √10) * (√2 - √3 + √10))
Simplifying further, we get:
(√2 - √3 + √10)/(2 - 3 + 10)
(√2 - √3 + √10)/(9)
Therefore, the rationalized form of the denominator for the expression 1/(√2 + √3 + √10) is (√2 - √3 + √10)/9.