中国古代数学著作《算法统宗》中记载了这样的一个问题“三百七十八里关,初行健步不为难,次日脚痛减一半,六朝才得到其关,要见次日行里数,请公仔细算相还”,其大意为:有一个人走了378里路,第一天健步行走,从第二天起,因脚痛每天走的路程为前一天的一半,走了6天后到达目的地,问此人前4天共走了( )
A.189里 | B.288里 | C.336里 | D.360里 |
22-23高二上·新疆伊犁·期末 查看更多[5]
新疆维吾尔自治区伊犁哈萨克自治州新源县第二中学2022-2023学年高二上学期期末考试数学试题(已下线)期末精确押题之单选题(45题)-2023-2024学年高二数学上学期《考点·题型·难点》期末高效复习(人教A版2019)(已下线)专题07 等比数列及其前n项和6种常见考法归类(3)(已下线)4.3.2 等比数列的前n项和公式(分层练习)-2023-2024学年高二数学同步精品课堂(人教A版2019选择性必修第二册)(已下线)高二上学期期末考点大通关真题精选100题(4)
更新时间:2023-12-23 16:04:21
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【推荐1】已知正项等比数列
的前
项和为
,
,且数列
的前
项和为
,若对于一切正整数
都有
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【推荐2】医学上常用基本传染数
来衡量传染病的传染性强弱,其中
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)表示
天内的累计病例数.据统计某地发现首例
型传染性病例,在
内累计病例数达到
例,取
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型传染病的基本传染数
.已知
型传染病变异株的基本传染数
(
表示不超过
的最大整数),平均感染周期为
天(初始感染者传染
个人为第一轮传染,经过一个周期后这
个人每人再传染
个人为第二轮传染,以此类推),则感染人数由
个初始感染者增加到
人大约需要的天数为( )(参考数据:
)
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【推荐1】若数列满足
,
,它的前n项和为
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【推荐2】已知等比数列
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