二分之一加六分之一加十二分之一加二十分之一加三十分之一=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6=1-1/6=5/6=6分之5
加油,小宇宙!
1/2+1/6+1/12+1/20+1/30=1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6=1-1/6=5/6
=1-1/2+1/2+1/2-1/3+1/4+1/4-1/5+1/5-1/6=1-1/6=5/6