2 1/10 =

To solve the mathematical expression "2 1/10" in Russian, you need to first convert the mixed number into an improper fraction.

"2 1/10" can be written as:

2 + 1/10 = 2 + 1/10 = 20/10 + 1/10 = 21/10.

Therefore, the result of "2 1/10" in Russian is "21/10" which translates to "двадцать одна десятая".