解题方法
1 . 已知公差不为0的等差数列
的前n项和为
,
,
是
和
的等比中项
(1)求数列
的通项公式;
(2)若
(其中[x]表示不超过x的最大整数),求数列
的前100项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9888a27d07f3a08109723fa25b60c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9c148812f80c05c821f8226990ecbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00136ab4fd69ba9c28b47cd38442dc3a.png)
您最近一年使用:0次
解题方法
2 . 已知数列
的前n项和为
,
,
.数列
是首项为1,公差d不为零的等差数列,且
,
,
成等比数列.
(1)求数列
与
的通项公式;
(2)如图,在平面直角坐标系
中,依次连接点
,得到折线
,求由该折线与直线
,
,
所围成的区域的面积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8370a173854471a3eb27637993a3d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d82e4c2294efbd33e1b268e9a0cec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548938d87c80ac47910607d3857007f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0fcf02ab751cc3910a0bc0872ac2a7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)如图,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcf67ed4c2bffbdc563286dbaaea11b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd0fb864b9546deedb0301d8dfab7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a7df955fc17e92fd86302f8c34664a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d220be549e3c9babdd050548d9406b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358fae9b6a6e55ea6256197760bd49b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896974349320192/2900174898642944/STEM/c329f720d5db48d6be678ec71c57af43.png?resizew=199)
您最近一年使用:0次
3 . 日晷是我国古代按照日影测定时刻的仪器,晷长即为所测量影子的长度.我国天文学和数学著作《周髀算经》中记载:一年有二十四个节气,每个节气的晷长损益相同.二十四节气及晷长变化如图所示,相邻两个节气晷长减少或增加的量相同,如此周而复始.已知每年冬至的晷长为一丈三尺五寸,夏至的晷长为一尺五寸(一丈等于十尺,一尺等于十寸),则每年二十四节气的晷长之和为( )
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896974349320192/2900174897963008/STEM/4455de33-bf7e-463e-a128-670e246f110a.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896974349320192/2900174897963008/STEM/fa0aacc4-5cec-4dee-afdb-d0359dc982d4.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896974349320192/2900174897963008/STEM/4455de33-bf7e-463e-a128-670e246f110a.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2896974349320192/2900174897963008/STEM/fa0aacc4-5cec-4dee-afdb-d0359dc982d4.png?resizew=174)
A.九丈七尺五寸 | B.十七丈五尺 | C.十八丈 | D.十九丈五尺 |
您最近一年使用:0次
2022-01-22更新
|
384次组卷
|
2卷引用:辽宁省营口市2021-2022学年高三上学期期末数学试题
11-12高一下·河北石家庄·阶段练习
4 . 已知正项等差数列
的前
项和为
,且满足
,
.
(1)求数列
的通项公式
;
(2)若数列
满足
且
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be180bd2a1d71acef043f60dc38632.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1aed322d5e349dacab0a9c35f810276.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d828157ffac7e399e94db9ea919b5a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1a208706fe64c4a6709e9de5da2bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2016-12-01更新
|
1634次组卷
|
9卷引用:辽宁省营口市第二高级中学2019-2020学年高三上学期第一次月考数学(文)试题
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