- 问题求解设
则a，b，c（）。 - A 、是等比数列，但不是等差数列
- B 、是等差数列，但不是等比数列
- C 、既是等比数列，也是等差数列
- D 、既不是等比数列，也不是等差数列
扫码下载亿题库
精准题库快速提分
参考答案【正确答案：B】
由题意
从而
即a，b，c成等差数列。
而
即a，b，c不成等比数列。
您可能感兴趣的试题热门试题换一换
- 爱尔兰有大片泥煤蕴藏量丰富的湿地。环境保护主义者一直反对在湿地区域采煤。他们的理由是开采泥煤会破坏爱尔兰湿地的生态平衡，其直接严重后果是会污染水源。然而，这一担心是站不住脚的。据近50年的相关统计，从未发现过因采煤而污染水源的报告。 以下哪项如果为真，最能加强题干的论证（）。
- 有一根圆柱形铁管，管壁厚度为0.1米，内径为1.8米，长度为2米.若将该铁管熔化后浇铸成长方体，则该长方体的体积为（）。（单位：立方米；π≈3.14）
- For Latins
- What do we learn from the first paragraph?（）
- L. A. Unified has made the rule about homework mainly because poor students （）.
- Theageing population can be locally a boon in（）.
- An oldsaying has it that half of all advertising budgets are wasted—the trouble is，no one knows which half. In theInternet age, at least in theory, this fraction can be much reduced. Bywatching what people search for，click on and sayonline, companies can aim "behavioural" ads at those most likely tobuy. In the pastcouple of weeks a quarrel has illustrated the value to advertisers of suchfine-grained information: Should advertisers assume that people are happy to betracked and sent behavioural ads? Or should they have explicit permission? In December 2010 America'sFederal Trade Commission (FTC) proposed adding a "do not track" (DNT)option to Internet browsers, so that users could tell advertisers that they didnot want to be followed. In February the FTC and the Digital AdvertisingAlliance agreed that the industry would get cracking on responding to DNTrequests.
- 中国城市人口急剧上升
亿题库—让考试变得更简单
已有600万用户下载
lqm5O