当前位置:首页>免费下载>【免费下载】25-26学年同步培优讲义第3课时 等比数列的综合应用(学生版课时跟踪检测

【免费下载】25-26学年同步培优讲义第3课时 等比数列的综合应用(学生版课时跟踪检测

  • 2026-02-26 06:50:26
【免费下载】25-26学年同步培优讲义第3课时 等比数列的综合应用(学生版课时跟踪检测

3课时等比数列的综合应用

1.由公比为q的等比数列a1,a2,…依次相邻两项的乘积组成的数列a1a2,a2a3,a3a4,…

A.等差数列

B.q为公比的等比数列

C.q2为公比的等比数列

D.以2q为公比的等比数列

2.(2024·湖州月考三个实数成等比数列,它们的和为14,且它们的积为64,则这三个数分别为

A.2,4,8B.8,4,2

C.2,4,8或8,4,2D.以上都不对

3.《九章算术》“竹九节问题现有一根9节的竹子,自上而下各节的容积成等比数列,上面3节的容积之积为3,下面3节的容积之积为9,则第5节的容积为

A.2B.

C.3D.

4.已知等比数列{an}中,a25{log2an}的前10项和为

A.-55B.-33

C.33D.55

5.(2024·安阳月考{an}是由正数组成的等比数列,公比q2,且a1·a2·a3··a30230,则a3·a6·a9··a30=(

A.210B.220

C.216D.215

6.下列说法正确的是

A.4n,nN*,则{an}为等比数列

B.anan2N*,则{an}为等比数列

C.aman2mn,m,nN*,则{an}为等比数列

D.anan3an1an2,nN*,则{an}为等比数列

7.(2024·广州月考和8之间插入3个数,使它们与这两个数依次构成等比数列,则这3个数的积为.

8.已知项数相同的等比数列{an}{bn},公比分别为q1,q2q1,q21),则数列①{3an},②{},③{2an3bn},④{2an·3bn}中是等比数列的是填序号).

9.(2024·开封月考我国生物科技发展日新月异,其中生物制药发展尤其迅速,某制药公司第一年共投入资金50万元进行新药开发,并计划每年投入的研发资金比上一年增加20%.按此规律至少到第年每年投入的资金可达250万元以上精确到1年).(参考数据lg 1.20.08,lg 50.70

10.已知三个数成等比数列,其积为512,如果第一个数与第三个数各减去2,则此时的三个数成等差数列,求原来的三个数的和.

11.(2024·青岛月考若数列{an}是等差数列,bn{bn}也是等差数列,类比这一性质可知,若正项数列{cn}是等比数列,且{dn}也是等比数列,则dn的表达式应为

A.dn

B.dn

C.dn

D.dn

12.(多选{an}(nN*是各项均为正数的等比数列,q是其公比,Kn是其前n项的积,且K5K6,K6K7K8,则下列选项中成立的是

A.0q1

B.a71

C.K9K5

D.K6K7均为Kn的最大值

13.设有4个数的数列{an}的前3项成等比数列,其和为m,后3项成等差数列,其和为6,则实数m的取值范围为.

14.某人买了一辆价值13.5万元的新车,专家预测这种车每年按10%的速度贬值.

1用一个式子表示nnN*年后这辆车的价值

2如果他打算用满4年时卖掉这辆车,他大概能得到多少钱?(精确到0.1

15.(2024·三门峡质检如图,各矩形块中填写的数字构成一个无穷数列,所有数字之和等于1.按照图示规律,有同学提出了以下结论,其中正确的是

A.矩形块中所填数字构成的是以1为首项,为公比的等比数列

B.由大到小的第八个矩形块中应填写的数字为

C.按照这个规律继续下去,第n1个矩形块中所填数字是

D.由大到小排列,是第七个矩形块中的数字

16.已知数列{Am}:a1,a2,…,amm2).若存在公比为q的等比数列{Bm1}:b1,b2,…,bm1,使得bkakbk1,其中k1,2,…,m,则称数列{Bm1}为数列{Am}等比分割数列”.若数列{A10}的通项公式为an2nn1,2,…,10),等比分割数列”{B11}的首项为1,求数列{B11}的公比q的取值范围.

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  125. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/contract/LogHandlerInterface.php ( 0.86 KB )
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  127. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/event/LogRecord.php ( 1.02 KB )
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  129. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/facade/View.php ( 1.70 KB )
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  133. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  134. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  135. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
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  137. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
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  139. /yingpanguazai/ssd/ssd1/www/yeyulingfeng.com/runtime/temp/8ef20ebb20ac8b82ec5232b0bcb62051.php ( 11.99 KB )
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  1. CONNECT:[ UseTime:0.001790s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001148s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000493s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000436s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000892s ]
  6. SELECT * FROM `set` [ RunTime:0.000384s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000977s ]
  8. SELECT * FROM `article` WHERE `id` = 470353 LIMIT 1 [ RunTime:0.004192s ]
  9. UPDATE `article` SET `lasttime` = 1772081632 WHERE `id` = 470353 [ RunTime:0.020405s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000520s ]
  11. SELECT * FROM `article` WHERE `id` < 470353 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000850s ]
  12. SELECT * FROM `article` WHERE `id` > 470353 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000701s ]
  13. SELECT * FROM `article` WHERE `id` < 470353 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001169s ]
  14. SELECT * FROM `article` WHERE `id` < 470353 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001588s ]
  15. SELECT * FROM `article` WHERE `id` < 470353 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012604s ]
0.154045s