Question

二分之一加六分之一加十二分之一加三十分之一加四十二分之一加五十六分之一等于多少？

Answer 1

1/2+1/6+1/12+1/30+1/42+1/56
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=(1-1/4)+(1/5-1/8)
=3/4+3/40
=33/40

楼主你中间好像漏写了一个1/20.如果是那样,则
1/2+1/6+1/12+1/20+1/30+1/42+1/56
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1-1/8
=7/8

Answer 2

1/2+1/6+1/12+1/20+1/30+1/42+1/56
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1-1/8
=7/8
我是老师，望采纳！

Answer 3

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加四十二分之一加五十六分之一
=1-1//12+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8

Answer 4

1/2+1/6+1/12+1/20+1/30+1/42+1/56
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1-1/8
=7/8