(9又1/2+7又1/6+5又1/12+3又1/20+1又1/30)*12=
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解决时间 2021-02-13 07:52
- 提问者网友:沉默菋噵
- 2021-02-12 22:01
(9又1/2+7又1/6+5又1/12+3又1/20+1又1/30)*12=
最佳答案
- 五星知识达人网友:掌灯师
- 2021-02-12 22:22
(9又1/2+7又1/6+5又1/12+3又1/20+1又1/30)*12
=(9+7+5+3+1+1/2+1/6+1/12+1/20+1/30)x12
=(25+1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)x12
=(25+1/2-1/6)x12
=25x12+1/2x12-1/6x12
=25x4x3+6-2
=300+4
=304
=(9+7+5+3+1+1/2+1/6+1/12+1/20+1/30)x12
=(25+1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)x12
=(25+1/2-1/6)x12
=25x12+1/2x12-1/6x12
=25x4x3+6-2
=300+4
=304
全部回答
- 1楼网友:詩光轨車
- 2021-02-13 00:20
(9又1/2+7又1/6+5又1/12+3又1/20+1又1/30)*12
=(9+7+5+3+1)*12+(1/2+1/6+1/12+1/20+1/30)*12
=25*12+(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)*12
=300+(1-1/6)*12
=300+10
=310
- 2楼网友:杯酒困英雄
- 2021-02-12 23:27
原式
=(1+3+5+...+17)+(1/6+1/12+1/20+...+1/90)
=(1+3+5+...+17)+[(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+...+(1/9-1/10)]
=81+(1/2-1/10)
=81又2/5
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