已知数列an=
试求a1+a100和a1-a2+a3-a4+…+a99-a100的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3179ce218f64764a7cdadba835e1d76f.png)
2021高二·全国·专题练习 查看更多[2]
(已下线)专题一 数列的概念-2020-2021学年高中数学专题题型精讲精练(2019人教B版选择性必修第三册)(已下线)5.1.1 数列的概念(课后作业)-2020-2021学年高中数学同步备课学案(2019人教B版选择性必修第三册)
更新时间:2021-10-05 23:38:00
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解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】记
为数列
的前
项和,知
,
.
(1)求
的值;
(2)求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a831cf9c63da1214cbc9059ec777f2f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe61d313eeca8ba47478a9de40540db8.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解答题-问答题
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较易
(0.85)
解题方法
【推荐2】根据数列的通项公式,分别写出其前4项与第10项.
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e8a39017d04386e3ce9c2773949d28.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9eaf4d448da30225af42c1540459aae.png)
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【推荐1】已知数列
的前n项和为
,满足
,且
是2与
的等差中项.
(1)求数列
的通项公式;
(2)若
,求数列
的前n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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4abfd2570605f62ab3964b7ccb8c0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐2】已知在等差数列
中,
,
(1)求数列
的通项公式;
(2)设
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd239584c05e3c19e429350720c8137d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477f72d00263a2720a53d4f41e7444c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffc6f39d373685678194906ea4f3412d.png)
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