等差数列连续的片段和还是等差数列
即:S4,S8-S4,S12-S8,S16-S12,成等差数列
设S4=1,则S8=3,S8-S4=2,S12-S8=3,S16-S12=4
S8/S16=3/7
设等差数列{an}的前n项和Sn,且S4/S8=1/3,则S8/S16=?
设等差数列{an}的前n项和Sn,且S4/S8=1/3,则S8/S16=?
数学人气:107 ℃时间:2020-05-14 11:47:34
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