3/1/3 - 1/1/5

To simplify the expression 3/1/3 - 1/1/5, let's first convert the fractions to their simplest form:

3/1/3 = 3/(1/3) = 3 * 3 = 9
1/1/5 = 1/(1/5) = 1 * 5 = 5

Now we have 9 - 5:

9 - 5 = 4

Therefore, 3/1/3 - 1/1/5 is equal to 4.