һw180̎ÿض߶ȵʮ֮һ
Ո@һֱoֹǰď߶֮ [s:4]_hͣO˼·
Ҕ(sh)Wȫ߀oώ˲W(sh)Ԓ@ҪЮI(y)yһoޔ(sh)йʽġ
ώMһ
ʾ@Ҕ(sh)Wώ҂
һw180̎ÿض߶ȵʮ֮һ
ȱȔ(sh)Ŀy20mÿض߀10/1
@Ҕ(sh)Wώ] W܇һv܇,҂˃ɂŮ(sh)Wώλcһξٛ]@}Ŀϧ10ǰˣF(xin)ڲ19.9999999.....8ȱȔ(sh)е֪R
Sn=n×a1 (q=1)
Sn=a1(1-q^n)/(1-q) =(a1-an*q)/(1-q) (q≠1)180/(1-1/10)ǂoFȱȔ(sh)͆.. ӛdz߀Ǹ
--------
yһoޔ(sh)
ĺԲӛ
ЂŽY(ji) [s:4]̫ǿď߶֮ͣ
ô20
һε180ײ㣬ȱȔ(sh)͆h 헳1pȵȱȔ(sh)͡
a1=18
0.1
@㶼
19.9999999.....8
㷨 [s:4]