0.25x0.25x...x0.25x4x...x4=1x2分之1+2x3分之1+3x4分之1+4x5分之1+...+97x98分之1+98x99分之1+99x100分之1=(1+2分之1)x(1+3分之1)x(1+4分之1)x...(1+18分之1)x(1+19分之1)x(1+20分之1)=
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/07 11:19:14
![0.25x0.25x...x0.25x4x...x4=1x2分之1+2x3分之1+3x4分之1+4x5分之1+...+97x98分之1+98x99分之1+99x100分之1=(1+2分之1)x(1+3分之1)x(1+4分之1)x...(1+18分之1)x(1+19分之1)x(1+20分之1)=](/uploads/image/z/13822951-31-1.jpg?t=0.25x0.25x...x0.25x4x...x4%3D1x2%E5%88%86%E4%B9%8B1%2B2x3%E5%88%86%E4%B9%8B1%2B3x4%E5%88%86%E4%B9%8B1%2B4x5%E5%88%86%E4%B9%8B1%2B...%2B97x98%E5%88%86%E4%B9%8B1%2B98x99%E5%88%86%E4%B9%8B1%2B99x100%E5%88%86%E4%B9%8B1%3D%281%2B2%E5%88%86%E4%B9%8B1%EF%BC%89x%EF%BC%881%2B3%E5%88%86%E4%B9%8B1%EF%BC%89x%EF%BC%881%2B4%E5%88%86%E4%B9%8B1%EF%BC%89x...%281%2B18%E5%88%86%E4%B9%8B1%EF%BC%89x%EF%BC%881%2B19%E5%88%86%E4%B9%8B1%EF%BC%89x%EF%BC%881%2B20%E5%88%86%E4%B9%8B1%EF%BC%89%3D)
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0.25x0.25x...x0.25x4x...x4=1x2分之1+2x3分之1+3x4分之1+4x5分之1+...+97x98分之1+98x99分之1+99x100分之1=(1+2分之1)x(1+3分之1)x(1+4分之1)x...(1+18分之1)x(1+19分之1)x(1+20分之1)=
0.25x0.25x...x0.25x4x...x4=
1x2分之1+2x3分之1+3x4分之1+4x5分之1+...+97x98分之1+98x99分之1+99x100分之1=
(1+2分之1)x(1+3分之1)x(1+4分之1)x...(1+18分之1)x(1+19分之1)x(1+20分之1)=
0.25x0.25x...x0.25x4x...x4=1x2分之1+2x3分之1+3x4分之1+4x5分之1+...+97x98分之1+98x99分之1+99x100分之1=(1+2分之1)x(1+3分之1)x(1+4分之1)x...(1+18分之1)x(1+19分之1)x(1+20分之1)=
第一题有几个0.25有几个4?若一样多,答案为1,乘法交换律嘛.
第二题把它拆成(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/99-1/100)=1-1/100=99/100=0.99
第三题3/2*4/3*……*21/20=21/2=10.5