Question

1/6加1/12加1/20加1/30加1/42加1/56加1/72等于

Answer 1

1/6+1/12+1/72+1/30+1/20+1/42+1/56

=(12+6+1)/72+(3+2)/60+(4+3)/168

=19/72+1/12+1/24

=(19+6+3)/72

=28/72

=7/18