解题方法
1 . 已知有穷数列
、
(
),函数
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/94f52bd7-eb80-462e-b83f-122a7931d7a7.png?resizew=187)
(1)如果
是常数列,
,
,
,在直角坐标系中在画出函数
的图象,据此写出该函数的单调区间和最小值,无需证明;
(2)当
,
(
)时,判断函数
在区间
上的单调性,并说明理由;
(3)当
,
,
时,求该函数的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3b7a416df75d4f8670214153b9f5d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af44b29c584de1e16bb6f46a8d1b6c75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/94f52bd7-eb80-462e-b83f-122a7931d7a7.png?resizew=187)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15ffa7fecea3704dc892ea8cd513c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44a8100f98999e472945ab7050af50d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/367e788c32187ae2cc97aaa24da1d40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d9e81193c41bc99745568cf8c08f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f812698a6f8b1e0041b1e08159a3d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a899d786e1c9ca96e401f07bea4e55b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c512846522aa513bd39f4b320ca68506.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80c1ed7b10ac7ca1cd81cdd39a8fcc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3393ba5ecb4e38bdcde190c8ffcaca92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc7c9137c7f1f0ce38a3b0cfd6d28696.png)
您最近一年使用:0次
名校
2 . 某公司举办捐步公益活动,参与者通过捐赠每天的运动步数获得公司提供的牛奶,再将牛奶捐赠给留守儿童.此活动不但为公益事业作出了较大的贡献,公司还获得了相应的广告效益.据测算,首日参与活动人数为
人,以后每天人数比前一天都增加
,
天后捐步人数稳定在第
天的水平,假设此项活动的启动资金为
万元,每位捐步者每天可以使公司收益
元(以下人数精确到
人,收益精确到
元).
(1)求活动开始后第
天的捐步人数,及前
天公司的捐步总收益;
(2)活动开始第几天以后公司的捐步总收益可以收回启动资金并有盈余?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1926eb08a21a8b6558fcfd4c52a4a23b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb7c16bd2a184286db865b73ae3c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03099476ad68d3ad530d75d662100f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(1)求活动开始后第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
(2)活动开始第几天以后公司的捐步总收益可以收回启动资金并有盈余?
您最近一年使用:0次
2020-01-07更新
|
276次组卷
|
5卷引用:上海市进才中学2021-2022学年高二下学期3月月考数学试题
上海市进才中学2021-2022学年高二下学期3月月考数学试题上海市市西中学2022届高三上学期12月月考数学试题上海市闵行区2017-2018学年高三上学期期末质量调研数学试题2018届上海市闵行区高三一模数学试题(已下线)专题5.4 数列的应用与数学归纳法(A卷基础篇)-2020-2021学年高二数学选择性必修第三册同步单元AB卷(新教材人教B版)