1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256=???
来源:百度知道 编辑:UC知道 时间:2024/05/16 04:51:20
谢谢拉,
由题可知1/256=1*(1/256);1/128=2*(1/256);1/64=4*(1/256);1/32=8*(1/256);1/16=16*(1/256);1/8=32*(1/256);1/4=64*(1/256);1/2=128*(1/256);
所以相加时可以提取公因式(1/256)
所以得 原式=(1/256)*(1+2+4+8+16+32+64+128)
=(1/256)*(255)
=255/256
原式=1/2+1/4+1/8+1/16+1/32+1/64+1/128+(1/256+1/256)-1/256
=1/2+1/4+1/8+1/16+1/32+1/64+(1/128+1/128)-1/256
=1/2+1/4+1/8+1/16+1/32+(1/64+1/64)-1/256
=...
=1-1/256
=255/256
等比数列求和
a1=1/2 q=1/2 n=8
Sn=1-(1/2)^8
S=1-(1/2)^8=255/256
(1+1/2+1/3+1/4)×
1/1+1/2+1/3+1/4+。。。。+1/N 是多少
1/1+1/2+1/3+1/4+......1/2002=?
1-1/2+1/3-1/4+........1/99-1/100
1+1/2+1+1/3+1+1/4+......+1/100=?
(1/2) (1/4+1/6)=
(1-1/2)(1-1/3)(1-1/4)(1-1/5).....(1-1/1000)
(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)
s=1/1+1/1!+1/2!+1/3!+1/4!+....+1/25!