1/2x3+1/3x4+1/4x5+1/5x6+1/6x7简便计算,做得好的有悬赏
答案:2 悬赏:60 手机版
解决时间 2021-04-19 13:11
- 提问者网友:树红树绿
- 2021-04-19 03:45
1/2x3+1/3x4+1/4x5+1/5x6+1/6x7简便计算,做得好的有悬赏
最佳答案
- 五星知识达人网友:冷風如刀
- 2021-04-19 04:47
1/3x2+1/3x4+1/4x5+1/5x6+1/6x7
=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1/2-1/7 (上式前括后一项与后括号前一项抵消)
=5/14
=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1/2-1/7 (上式前括后一项与后括号前一项抵消)
=5/14
全部回答
- 1楼网友:北方的南先生
- 2021-04-19 05:35
1/1X2+1/2X3+1/3X4+1/4X5+1/5X6+1/6X7
=1-1/2+1/2-1/3+1/3-1/4+....+1/6-1/7
=1-1/7
=6/7
望采纳
谢谢!
=1-1/2+1/2-1/3+1/3-1/4+....+1/6-1/7
=1-1/7
=6/7
望采纳
谢谢!
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