1 . 已知
为数列
的前
项和,且
,
(
).给出下列3个结论:①数列
一定是等比数列;②若
,则
;③若
,
,
成等比数列,则
.其中,所有正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/9f17a7b5a8970e7e8da883b2e93d3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7fab51121848ce166035ceab6f4e00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6409c388f766ff05be0e5d080bed2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a1d093160d34fe50bbcedff8f5bc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/001d1773df6520fba1d44007fe942836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9f0255df77526718a46c4e78b78513.png)
A.② | B.②③ | C.①③ | D.①②③ |
您最近一年使用:0次
名校
解题方法
2 . 如图,在边长为2的正方形
中,点
是边
的中点,将
沿
翻折到
,连结
,
,在
翻折到
的过程中,下列说法正确的是_________ .(将正确说法的序号都写上)
的体积的最大值为
;
②当面
平面
时,二面角
的正切值为
;
③存在某一翻折位置,使得
;
④棱
的中点为
,则
的长为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb62dd4766d11cfec3aee092b99e40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb62dd4766d11cfec3aee092b99e40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec53c9cc69c2e3943ec8df5d5b5d44c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
②当面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392469b357b12b998528499929366c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d2d267caf23c33bf34f6e2764ada9c.png)
③存在某一翻折位置,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0efbdc4cbc82cc55bed9905f81fbfc2.png)
④棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
您最近一年使用:0次
2021-12-10更新
|
1090次组卷
|
3卷引用:福建省浦城第一中学2023-2024学年高一下学期4月期中考试数学试题
福建省浦城第一中学2023-2024学年高一下学期4月期中考试数学试题(已下线)第八章 立体几何初步(提分小卷)-【单元测试】2021-2022学年高一数学尖子生选拔卷(人教A版2019必修第二册)黑龙江省哈尔滨师范大学附属中学2021-2022学年高三上学期期中考试数学(理)试题