解题方法
1 . 已知点
与点
在直线
的两侧,给出下列说法:
①
;
②当
时,
有最小值,无最大值;
③
;
④当
且
时,
的取值范围是
.
其中所有正确说法的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8530bca5123179cfede86d03738495e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c53ea2ddc3bf3fc9b926af55d462a02b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b481ff501f2173c755b338d9b94ce02.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e377720fcc0e18ffa0b6e477bb0086.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6cc07106cfb74d20da736872d777149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbac6c9561350ac84cd903500fcf82d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8126b4b9450c410a0c0ee7dc170a1c5b.png)
其中所有正确说法的序号是
您最近一年使用:0次
2016-12-04更新
|
1138次组卷
|
3卷引用:2016届陕西西北工业大学附中高三二模数学(文)试卷
12-13高一上·陕西西安·期末
2 . .已知直线
平面
,直线
平面
,下面三个说法: ①
;②
;③
则正确的说法为_____________ (填正确说法的序号).
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570707820879872/1570707826130944/STEM/9985e1a2ef884d3880492c7e058aee2c.png?resizew=25)
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570707820879872/1570707826130944/STEM/fc410015ce7d442587b8ee37f6f9ec96.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570707820879872/1570707826130944/STEM/3103752360ef444abf20bc13de4881cc.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570707820879872/1570707826130944/STEM/2742ef00bf794febb127a174020c8802.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570707820879872/1570707826130944/STEM/971c10002308421089a1b5015a4e6d3f.png?resizew=100)
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570707820879872/1570707826130944/STEM/292fcdaea9504d9a853e0b32d7e04101.png?resizew=100)
![](https://img.xkw.com/dksih/QBM/2012/2/1/1570707820879872/1570707826130944/STEM/bd781b0bb8cc4a6c9b0f610af29b968b.png?resizew=102)
您最近一年使用:0次
2012高三·陕西·竞赛
3 . 对正整数
,若
,当
最小时,则称
为
的“最佳分解”,并规定
(如
的分解有
,其中,
为
的最佳分解,则
).关于
有下列四个判断:
①
;②
;③
;④
.其中,正确判断的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6624194f7f2eaa625de3e36ccf1606db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18938707dd88a824c9f6d9b1870b56e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0bfac37657cb095fb00cae72b49d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9857be833d6c6166529c30def21fddd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38034572c627f85b938541badf004587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca9596f4b49db923a41530e1973c32e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3780fb8822d2de7e270d450d4facad60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13680c4c00ba1780911bfa92b717270a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914c08afa3b18ce6ee1480d71d59d4af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65d292cdb1d66ea7f96e96047ca9a44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7931849d69bf8c99d28b2a0eae213f59.png)
您最近一年使用:0次
4 . 下列关于K2的说法正确的是( )
A.K2在任何相互独立问题中都可以用来检验有关还是无关 |
B.K2的值越大,两个事件的相关性就越大 |
C.K2是用来判断两个分类变量是否有关系的,只对于两个分类变量适合 |
D.K2的观测值k的计算公式为![]() |
您最近一年使用:0次
2018-10-07更新
|
658次组卷
|
4卷引用:陕西省延安市黄陵中学2020-2021学年高二下学期第一次月考文科数学试题
陕西省延安市黄陵中学2020-2021学年高二下学期第一次月考文科数学试题2018-2019学年高中数学选修2-3人教版练习:章末评估验收(三)(已下线)人教A版选修2-3综合测试-2020-2021学年高二数学(理)下学期期末专项复习(人教A版)(已下线)第八章 成对数据的统计分析 (单元测试)-【上好课】高二数学同步备课系列(人教A版2019选择性必修第三册)