1 + 1 / 2 + 1 / 3 + 2 / 3 + 1 / 4 + 2 / 4 + 3 / 4 + 1 / 5 + 2 / 5 + 5 Come on! There should be a process!!! Process!!!

1 + 1 / 2 + 1 / 3 + 2 / 3 + 1 / 4 + 2 / 4 + 3 / 4 + 1 / 5 + 2 / 5 + 5 Come on! There should be a process!!! Process!!!

1+1/2+1/3+2/3+1/4+2/4+3/4+1/5+2/5+5
=1+(1/2+2/4)+(1/3+2/3)+(1/4+3/4)+5+(1/5+2/5)
=1+1+1+1+5+3/5
=9 and 3 / 5

One half, one third, two thirds, one fourth, two quarters, three quarters, one fifth, two fifths, five fifths, four fifths
What is the hundredth number?

If 1 / 2 denominator is 2, there is one number
If the denominator of 1 / 3 and 2 / 3 is 3, there are two numbers
If the denominator of 1 / 4, 2 / 4 and 3 / 4 is 4, there are four numbers
There are four numbers with 1 / 5,2 / 5,3 / 5,4 / 5 denominator 5
∵1+2+3+...+13=91,1+2+3+...+14=105
The denominator of the 100th number should be 15, the numerator is 9, and this number is 9 / 15