Let A = 1/1.00...001 (there are 99 zeros in the expression). Convert A in decimal number and describe the pattern after the decimal point.
0.00...001 = 10^-100 so the fraction can be written
1 / (1+10^-100)
multiply the numerator an denominator by a googol to get
10^100 / (10^100 + 1)
(10^200 - 10^100) / (10^200 - 1)