1+1/2+1/2^2+1/2^3......1/2^100
来源:百度知道 编辑:UC知道 时间:2024/05/27 18:40:12
单纯计算很复杂,不妨设再加多一个1/2^100
则原式=1+1/2+1/4+1/8……+1/2^100+1/2^100-1/2^100
=2-1/2^100
大概就是这个样子吧.再计算出来几乎是不可能的
这是一个等比数列,公比为1/2.
由公式得S=(1-1/2^101)/(1-1/2)
=2-1/2^100
1+1/2+1/2^2+1/2^3......1/2^100
=1*[1-(1/2)^101]/(1-1/2)
=2*[1-(1/2)^101]
Sn=1+1/2+1/2^2+1/2^3......1/2^100
1/2Sn=1/2+1/2^2+1/2^3......1/2^101
Sn-1/2Sn=1-1/2^101
Sn=2-1/2^100
有公式啊
1/2-1/2=?
(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)
(1-1/2^2)*(1-1/3^2)*(1-1/4^2).......(1-1/100^2)
3/2=2+1/1*2=1/1+1/2
1+1/(1+2)+1/(1+2+3)+...+1/(1+2+3+...+100)
1+1/(1+2)+1/(1+2+3)+-------+1/(1+2+3+----+100)
1+1/1+2+1/1+2+3+...+1/1+2+3...+2000
1+1/1+2+1/1+2+3.........+1/1+2+3.....100
1*(1/1+2)*(1/1+2+3)*~~~*(1/1+2+~~~2005)=?
1/1^2+1/2^2+...+1/n^2<2