发布网友 发布时间:2024-10-24 09:30
共4个回答
热心网友 时间:2024-10-25 11:18
你好:
1/20+1/30+1/42+1/56+1/72+1/90
=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1/4-1/10
=0.25-0.1
=0.15
=3/20
(此题可以拆分,1/20=1/4-1/5,1/30-1/5-1/6,1/42=1/6-1/7,1/56=1/7-1/8,1/72=1/8-1/9,1/90-1/9-1/10)
希望我的回答对您有帮助!
热心网友 时间:2024-10-25 11:23
3/20
热心网友 时间:2024-10-25 11:17
原式=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1/4-1/10
=3/20
热心网友 时间:2024-10-25 11:19
原式=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
= 1/4-1/10
=3/20