Question

不通分计算 6分之1+12分之1+20分之1+30分之1+42分之1=

Answer 1

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

=1/6+1/12+(1/20+1/30)+1/42

=1/6+1/12+1/12+1/42

=1/6+1/6+1/42

=1/3+1/42

=5/12