1/11x1/13十1/13x1/15十1/15x1/17
答案:2 悬赏:10 手机版
解决时间 2021-02-02 04:17
- 提问者网友:绫月
- 2021-02-01 15:56
1/11x1/13十1/13x1/15十1/15x1/17
最佳答案
- 五星知识达人网友:舍身薄凉客
- 2021-02-01 16:41
1/11×1/13=(1/11-1/13)/2 1/13×1/15=(1/13-1/15)/2 1/15×1/17=(1/15-1/17)/2
1/11×1/13+1/13×1/15+ 1/15×1/17=(1/11-1/13)/2 +(1/13-1/15)/2 +(1/15-1/17)/2=(1/11-1/13+1/13-1/15+1/15-1/17)/2=(1/11-1/17)/2=6/187÷2=3/187
1/11×1/13+1/13×1/15+ 1/15×1/17=(1/11-1/13)/2 +(1/13-1/15)/2 +(1/15-1/17)/2=(1/11-1/13+1/13-1/15+1/15-1/17)/2=(1/11-1/17)/2=6/187÷2=3/187
全部回答
- 1楼网友:拜訪者
- 2021-02-01 17:05
裂项法:
1/11x1/13十1/13x1/15十1/15x1/17
=1/2×(1/11-1/13+1/13-1/15+1/15-1/17)
=1/2×(1/11-1/17)
=1/2×6/187
=3/187
1/11x1/13十1/13x1/15十1/15x1/17
=1/2×(1/11-1/13+1/13-1/15+1/15-1/17)
=1/2×(1/11-1/17)
=1/2×6/187
=3/187
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