1∕6+1∕24 +1∕60 + 1∕120 +1∕210 +1∕336 +1∕112用拆分法如何做?
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解决时间 2021-04-12 20:17
- 提问者网友:遁入空寂
- 2021-04-12 05:26
1∕6+1∕24 +1∕60 + 1∕120 +1∕210 +1∕336 +1∕112用拆分法如何做?
最佳答案
- 五星知识达人网友:胯下狙击手
- 2021-04-12 06:07
原式=(2/6+2/24+2/60+2/120+2/210+2/336+2/112)1/2
=(1/1*2-1/2*3+1/2*3-1/3*4+1/3*4-1/4*5+1/4*5-
1/5*6+1/5*6-1/6*7+1/6*7-1/7*8+2/112)1/2
=(1/2-1/7*8+2/112)1/2
=1/4
=(1/1*2-1/2*3+1/2*3-1/3*4+1/3*4-1/4*5+1/4*5-
1/5*6+1/5*6-1/6*7+1/6*7-1/7*8+2/112)1/2
=(1/2-1/7*8+2/112)1/2
=1/4
全部回答
- 1楼网友:洎扰庸人
- 2021-04-12 09:05
原式=1/6(1+1/4)+1/60(1+1/2)+1/112(1/3+1)+1/210
=1/6*5/4+1/60*3/2+1/112*4/3+1/210
=5/24+1/40+1/84+1/210
=1/6(5/4+3/20+1/14+1/35)
=1/6(25/20+1/20+2/20)
=1/6*3/2
=1/4
=1/6*5/4+1/60*3/2+1/112*4/3+1/210
=5/24+1/40+1/84+1/210
=1/6(5/4+3/20+1/14+1/35)
=1/6(25/20+1/20+2/20)
=1/6*3/2
=1/4
- 2楼网友:梦中风几里
- 2021-04-12 07:37
解:1∕336 +1∕112=1/84
原式=(1/6)×(1+1/4+1/10+1/20+1/35+1/14)
=(1/6)×(1+1/4+1/10+1/20+1/10)
=(1/6)×(20+5+2+1+2)/20
=(1/6)×3/2
=1/4
原式=(1/6)×(1+1/4+1/10+1/20+1/35+1/14)
=(1/6)×(1+1/4+1/10+1/20+1/10)
=(1/6)×(20+5+2+1+2)/20
=(1/6)×3/2
=1/4
- 3楼网友:神鬼未生
- 2021-04-12 06:40
合并最后两项,提取公因式1/6,剩余1+1/4+1/10+1/20+1/35+1/14
再合并最后两项=1/10
所以=1/6*3/2=1/4
再合并最后两项=1/10
所以=1/6*3/2=1/4
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