Question

2分之1加6分之1加12分之1加加20分之1加30分之1加42分之1的和是多少？

苏教版2011年20页的智力冲浪第6题！我很急！请速给答案！谢谢。
无需过程

Answer 1

1/2+1/6+1/12+1/20+1/30+1/42
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1-1/7
=6/7
欢迎提问

Answer 2

原式=6/7
过程如下
1/2+1/6+1/12+1/20+1/30+1/42=1-1/2+1/2-1/3……+1/6-1/7=1-1/7=6/7

Answer 3

97分之105

Answer 4

=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1-1/7
=6/7

Answer 5

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