1 . 某四面体的三视图如下图所示,已知其正视图、侧视图、俯视图是全等的等腰直角三角形,记命题
从该四面体的四个面所在的平面中任取两个,取到的两个平面互相垂直的概率为
;命题
设该四面体的四个顶点恰好是一个正方体的顶点,从这个正方体中任取一点,取自四面体内的概率为
.则下列命题为真命题的是( )
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897210152910848/2921386616832000/STEM/403dafe1-9e6d-43b1-a35b-b74d3f3ca492.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897210152910848/2921386616832000/STEM/403dafe1-9e6d-43b1-a35b-b74d3f3ca492.png?resizew=139)
A.![]() | B.![]() | C.![]() | D.![]() |
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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
|
282次组卷
|
3卷引用: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)
(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)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
3 . 下列结论不正确的是( )
A.![]() |
B.![]() |
C.![]() |
D.若![]() ![]() ![]() |
您最近一年使用:0次