2 / 3 + 2 / 8 + 2 / 15 + 2 / 24 + 2 / 35 + 2 / 48 + 2 / 63 + 2 / 80 After forgetting to write It's over

2 / 3 + 2 / 8 + 2 / 15 + 2 / 24 + 2 / 35 + 2 / 48 + 2 / 63 + 2 / 80 After forgetting to write It's over

The original formula is 1-1 / 3 + 1 / 2-1 / 4 + 1 / 3-1 / 5 + 1 / 4-1 / 6 + 1 / 5-1 / 7 + 1 / 6-1 / 8 + 1 / 7-1 / 9 + 1 / 8-1 / 10
=1+1/2-1/9-1/10
=3/2-19/90
=58/45