1 . 已知数列
满足
,
,
,则数列
的前
项和为 ______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5c885cdd15d16ade15d8c5c42083df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
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2 . 已知函数,若关于
的方程
恰有
个不同实数根,则实数
的取值范围为
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3 . (1)已知两个变量线性相关,若它们的相关性越强,则相关系数的绝对值越接近于
;
(2)正态曲线当
一定时,
越小,总体分布越集中,
越大,总体分布越分散;
(3)对于分类变量
与
的随机变量
,
越大说明“
与
有关系”的可信度越大;
(4)在刻画回归模型的拟合效果时,残差平方和越小,相关指数
的值越大,说明拟合的效果越好;
(5)根据最小二乘法由一组样本点
,求得的回归方程是
,对所有的解释变量
,
的值一定与
有误差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
以上命题正确的序号为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(2)正态曲线当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0ad7e7853a069537387b5192f73844.png)
(3)对于分类变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2581192317ef233ccdccfc48ac29b52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2581192317ef233ccdccfc48ac29b52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(4)在刻画回归模型的拟合效果时,残差平方和越小,相关指数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
(5)根据最小二乘法由一组样本点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef046c85a536174bec951a53d9f60b33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf653695b1a305246bfeb5f1e3ac8465.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
以上命题正确的序号为
您最近一年使用:0次
解题方法
4 . 已知正实数
,
满足
,且
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0cbb08478b0f5f3ea089ab26eab4ad6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a35c3ba9d031b7566ed502a977e78a9.png)
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5 . 已知空间向量
,则向量
在向量
上的投影向量是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a193f336342704840f3de47dac8d863a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
您最近一年使用:0次
解题方法
6 . 已知函数
是幂函数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d1a0d48257429e3c6976ef6bdf23b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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解题方法
7 . 设直线
与圆
相交于
两点,且弦
的长为2,则实数
的值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb718f1c0f7019503b92e11e92ec4c12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d00483a05dd88fbd59cd2c95dbaf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2023-09-23更新
|
719次组卷
|
2卷引用:天津市河东区2023-2024学年高二上学期期中数学试题
8 . 过点
作圆
的切线
则切线长为______ ,过切点A,B的直线方程为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/704bdc451ab8f0ffa406993c59ab9913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b7615accfdce025efc2d02012c8501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a323c48a9562431cd9a44c1a21cc9e73.png)
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2023-08-18更新
|
233次组卷
|
2卷引用:天津市河东区2023-2024学年高二上学期期中数学试题
名校
9 . 如图,在长方体
中,
,
.
,M,N分别是棱
,
,
的中点.若点P是平面
内的动点,且满足
平面
,则线段
长度的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6155f82a6f64b20085976cea9b64193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efa6463e3070ffd0db08132ee42087e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f79db7c270b6ff9fb0a538ee201cfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e06947327f4c41340b8713e8a6b4c87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/f569ab9f-ef89-4e37-924c-0dcbb55ab563.png?resizew=176)
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2023-09-28更新
|
484次组卷
|
5卷引用:天津市河东区天铁第二中学2022-2023学年高二上学期期中模拟数学试题(四)
天津市河东区天铁第二中学2022-2023学年高二上学期期中模拟数学试题(四)安徽省芜湖市无为襄安中学2023-2024学年高二上学期期中数学试题(已下线)高二上期中真题精选(易错60题30个考点专练)【考题猜想】-2023-2024学年高二数学上学期期中考点大串讲(人教A版2019选择性必修第一册)(已下线)1.4.1 用空间向量研究直线、平面的位置关系【第三练】(已下线)第二章 立体几何中的计算 专题七 空间范围与最值问题 微点2 线段、距离、周长的范围与最值问题(二)【基础版】
10 . 一条直线经过两点
,
,则该直线的倾斜角
是________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df3cb9ee0c2e421226067e7455329c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131a9054666eaa90af6d8c2bf151c5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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