名校
1 . 等差数列
的前
项和为
,若
,公差
,有以下结论:
①若
,则必有
; ②若
,
,则
;
③若
,则必有
; ④若
,则必有
.
其中所有正确结论的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63911d261ebb75e0ab8f76b58cbb7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e93339c2793d3d8add8cd5770d20fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6c2e49c873187b12e90a7b4d5d906b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b043acaf51edc23e735492fa61e66f4.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea31d9dcfd7fba1b7c90d4c349525ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe9f984aaa409de0dde80189cda4d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d77bb6b1a5ca128223c897cf09ba19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9a959dda5985723ef15d5d31ea6a25.png)
其中所有正确结论的序号为
您最近一年使用:0次
2021-08-03更新
|
624次组卷
|
3卷引用:四川省资中县第二中学2022-2023学年高二上学期开学考试理科数学试题
名校
解题方法
2 . 在四棱锥
中,平面
平面
,底面
为梯形,
,
.
①
平面
;
②
平面
;
③
是棱
的中点,棱
上存在一点
,使
.正确命题的序号为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/a8b6fbee-973b-46c0-a9b5-0c9ebf466ae8.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5067751c639aab4d15bd92fad965dcd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/a8b6fbee-973b-46c0-a9b5-0c9ebf466ae8.png?resizew=153)
A.①② | B.①③ | C.②③ | D.①②③ |
您最近一年使用:0次
名校
3 . 给出以下几个结论:
①若
,
,则
;
②如果
且
都不为
,则
,
;
③若
,
是夹角为
的两个单位向量,则
,
的夹角为
;
④在
中,三内角
所对的边分别为
,则
;
其中正确结论的序号为______ .
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90882db1028f1e2440339d203c1901e6.png)
②如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6893511ebfd1fac1412774e04e10748d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bc5f0ef5e9129e22310d5ea17cf1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5600adbf8003f263ae7baf49c05071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2868a9fe011f56a80c9d1a8ee4604d59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36fe4e713c108e118522a99ecd683924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0942b32552d016471809659af20ac97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c7e86192bb666b3fb41b3694e79d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
④在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be845b564ed27a6093a44e5be491601.png)
其中正确结论的序号为
您最近一年使用:0次
2020-05-15更新
|
407次组卷
|
2卷引用:四川省内江市第六中学2020-2021学年高二上学期开学考试数学(理)试题
名校
解题方法
4 . 已知直线
与双曲线
相交于M、N两点,双曲线C的左、右顶点分别为A、B,若直线AM与BN相交于点P,则下列说法正确的有______ (填写正确命题的序号)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2889999141822464/2912159608569856/STEM/34487f5d-4b1f-458b-bdcb-20c8b8eb0b0e.png?resizew=167)
①实数
的取值范围为
或
;②直线AM与直线BN的斜率之积为定值;③点P在椭圆
上;④三角形PAB的面积最大值为ab.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc1331519fd9ca511b19148878b1cacc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5c2e64358e0ec7aa142c336d970306.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2889999141822464/2912159608569856/STEM/34487f5d-4b1f-458b-bdcb-20c8b8eb0b0e.png?resizew=167)
①实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb193ae31142011d07756aa27b75dad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86474b8b559afef08fa4ea228f84b77e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
您最近一年使用:0次
2022-02-08更新
|
1775次组卷
|
4卷引用:四川省内江市威远中学校2021-2022学年高二下学期第一次月考数学(文)试题
四川省内江市威远中学校2021-2022学年高二下学期第一次月考数学(文)试题安徽省示范高中2021-2022学年高三上学期冬季联赛理科数学试题(已下线)专题11 圆锥曲线第三定义与点差法 微点1 圆锥曲线第三定义的应用(已下线)第八章 解析几何 专题9 圆锥曲线第三定义的应用 高中数学优质试题一题多解和变式训练