急,1998/1*2+1998/2*3+1998/3*4+1998/4*5+1998/5*6,这道题怎么做?
答案:3 悬赏:50
解决时间 2021-02-16 08:26
- 提问者网友:我喜歡係
- 2021-02-15 22:22
急,1998/1*2+1998/2*3+1998/3*4+1998/4*5+1998/5*6,这道题怎么做?
最佳答案
- 二级知识专家网友:疯山鬼
- 2021-02-16 00:00
1998/1*2+1998/2*3+1998/3*4+1998/4*5+1998/5*6
=1998*(1/1*2+1/2*3+1/3*4+1/4*5+1/5*订乏斥何俪蛊筹坍船开6)
=1998*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=1998*(1-1/6)
=1998*5/6
=1665
=1998*(1/1*2+1/2*3+1/3*4+1/4*5+1/5*订乏斥何俪蛊筹坍船开6)
=1998*(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=1998*(1-1/6)
=1998*5/6
=1665
全部回答
- 1楼网友:时光挺欠揍
- 2021-02-16 02:19
1/1×2=1-1/2
1/2×3=1/2-1/3
1998/1×2+1998/2×3+1998/3×4+1998/4×5+1998/5×6
=1998(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=1998(1-1订乏斥何俪蛊筹坍船开7;6)
=1998×5/6
=1665
- 2楼网友:晨与橙与城
- 2021-02-16 01:16
1998/1*2+1998/2*3+1998/3*4+1998/4*5+1998/5*6
=1998x[(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)]
=1998x(1-1/6)
=1998x5/6
=1665
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