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1 . 已知命题p:利用系统抽样的方法从100个人中抽取5人,需要分成20组,组距为5;命题q:利用最小二乘法求得的线性回归直线过样本的平均点
.对于命题①
;②
;③
;④
.其中为真命题的序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6570492ffb2968a8ee7d0c5596e533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb9d57cbe246df4aa7b2e12e4aed9ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a464aa880b9557686ddf53396129166.png)
您最近一年使用:0次
2 . 有下列命题:
:幂函数
的定义域为实数集
;
:已知数据
,
,…,
的平均数为
,方差
,则
;
:若
函数的导函数为
,
的解为
,则
为函数
的极值点;
:变量
,
负相关,相关系数为
,则
越大相关性越弱,越小相关性越强.则真命题为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be646cd52d7f2f1714e7542e75810f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7149a3e582195e80d53797aa163c859c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cffbfcca9063662cac2626ba5e9abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab9db19467c02c2884f7166bcdb8f00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20981fbc04f7461658b2921d6812582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b21b872313f7d8c5b606981f954a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbadbb09da422f97c3757082869fa50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc119550ce4fc5f3d1daf996e7243bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2021-05-28更新
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282次组卷
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3卷引用:陕西省西安市八校2021届高三下学期第三次联考文科数学试题
陕西省西安市八校2021届高三下学期第三次联考文科数学试题陕西省西安地区八校联考2021届高三下学期高考押题理科数学试题(已下线)专题03 逻辑联结词、全称量词与存在量词-备战2022年高考数学(理)母题题源解密(全国乙卷)