1/2*4+1/4*6+1/6*8+1/48*50
答案:5 悬赏:30 手机版
解决时间 2021-02-12 09:45
- 提问者网友:风月客
- 2021-02-12 05:24
1/2*4+1/4*6+1/6*8+1/48*50
最佳答案
- 五星知识达人网友:青尢
- 2021-02-12 05:47
1/2*4+1/4*6+1/6*8+.......1/48*50
=1/2(1/2-1/4)+1/2(1/4-1/6)+1/2(1/6-1/8)+.....1/2(1/48-1/50)
=1/2(1/2-1/4+1/4-1/6+...+1/48-1/50)
=1/2(1/2-1/50)
=6/25
=1/2(1/2-1/4)+1/2(1/4-1/6)+1/2(1/6-1/8)+.....1/2(1/48-1/50)
=1/2(1/2-1/4+1/4-1/6+...+1/48-1/50)
=1/2(1/2-1/50)
=6/25
全部回答
- 1楼网友:深街酒徒
- 2021-02-12 10:30
2+3/2+4/3+25/24=141/24
- 2楼网友:舍身薄凉客
- 2021-02-12 08:50
141/24
有意思么?
- 3楼网友:一袍清酒付
- 2021-02-12 07:42
1/2*4+1/4*6+1/6*8+......+1/48*50
=2(1/2-1/4+1/4+1/6+...+1/48-1/50)
=2(1/2-1/50)
=24/25
- 4楼网友:雾月
- 2021-02-12 06:19
题目会否有误,原式是否就为:1/2*4+1/4*6+1/6*8+1/48*50=1/8+1/24+1/48+1/48×50=(6×50+2×50+50+1)/48×50=451/2400
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