12-13高二上·重庆·期中
名校
1 . 记动点P是棱长为1的正方体
的对角线
上一点,记
.当
为钝角时,则
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a80427c5520818aa57e4de7bb5ce7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74aa1320e5020d0ceed159ab933c4df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-02更新
|
1383次组卷
|
6卷引用:陕西省西安市西北大学附中2019-2020学年高二上学期期中数学试题
名校
2 . 已知正方体
,若
,则正方体的棱长等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec233e30a7080f40192d56afe1cae9e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-08-09更新
|
288次组卷
|
2卷引用:陕西省西安市长安区第一中学2020-2021学年高二上学期期中数学(理)试题
名校
3 . 设
是边长为
的正方体,
与
相交于点
,则有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cdc08e1c4a04a18d5ecea03393e36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
4 . 已知点
.
(1)若
,且
,求
;
(2)求
;
(3)若
与
垂直,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad03ed4c2abc28e6dfdb013825f27ae4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20fa7f552578bfc7444ae25155dc9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f298231567e17db35754bdb198aed93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255f87a68d12e15e6404243c6434dae1.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437ff8d607d176fc4655e0e507300697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f649c7d34679f06e29e92ae3b4718e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
名校
解题方法
5 . 在空间四边形
中,
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e902026945dcab2fc0f6a8374fa89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9acdabbbcfa6185a39659a416a4218.png)
A.![]() | B.![]() | C.![]() | D.0 |
您最近一年使用:0次