1/2加1/6加1/20加1/30加1/42等于多少?
答案:3 悬赏:50 手机版
解决时间 2021-03-20 17:03
- 提问者网友:世勋超人
- 2021-03-19 23:20
1/2加1/6加1/20加1/30加1/42等于多少?
最佳答案
- 五星知识达人网友:夜风逐马
- 2021-03-20 00:11
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)
=1-1/2+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
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1-1/2+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
全部回答
- 1楼网友:蓝房子
- 2021-03-20 01:13
=1/2-1/3+1/3-1/4+1/4-1/5+...+1/8-1/9
=1/2-1/9
=7/18
- 2楼网友:鱼芗
- 2021-03-20 00:17
1-1/2+1/2-1/3+1/3-1/4+......+1/6-1/7=6/7
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