To find the sum of these fractions, we can first simplify each fraction by finding a common denominator:

5/1.3 = 5/(13/10) = 50/13
5/3.5 = 5/(35/10) = 50/35 = 10/7
5/5.7 = 5/(57/10) = 50/57
5/7.9 = 5/(79/10) = 50/79
...
5/99.101 = 5/(99101/1000) = 5000/99101

Now, we can add all these fractions together:

50/13 + 10/7 + 50/57 + 50/79 + ... + 5000/99101

To add fractions with different denominators, we need to find a common denominator. In this case, the common denominator would be the product of all the denominators (13 * 7 * 57 * 79 * ... * 99101).

After finding the common denominator, we can add the numerators together and simplify the fraction if needed.