如图,已知平行六面体ABCD—A1B1C1D1的底面ABCD是菱形,且∠C1CB=∠C1CD=∠BCD=60°
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854698838319104/2857372135292928/STEM/09d07ed6f6e14b4bb5acfa9c863110f0.png?resizew=194)
(1)证明:C1C⊥BD;
(2)当
的值为多少时,能使A1C⊥平面C1BD?请给出证明.
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854698838319104/2857372135292928/STEM/09d07ed6f6e14b4bb5acfa9c863110f0.png?resizew=194)
(1)证明:C1C⊥BD;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56149ce7d8ec1225d2efedc06b8a3b2.png)
21-22高二上·上海静安·期中 查看更多[4]
上海市市西中学2021-2022学年高二上学期期中数学试题(已下线)第13课时 课中 直线与平面垂直的性质(已下线)第05讲线线、线面、面面垂直的判定与性质(核心考点讲与练)(1)(已下线)第四节?直线,平面垂直的判定与性质(讲)
更新时间:2021-11-23 10:41:24
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【推荐1】如图,在三棱台
中,
,平面
平面
,
.
平面
;
(2)若三棱锥
的体积为
,求平面
与平面
的夹角的余弦值.
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(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38593653bedb845ecfa820806a29a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
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【推荐2】已知三棱锥P—ABC中,PC
底面ABC,AB=BC,D、F分别为AC、PC的中点,DE
AP于E.(1)求证:AP
平面BDE;(2)求证:平面BDE
平面BDF;(3)若AE:EP=1:2,求截面BEF分三棱锥P—ABC所成上、下两部分的体积比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
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【推荐1】如图,直三棱柱
中,侧面
为正方形,
,D,E,F分别为
,
,
的中点,
,G为线段
上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/14/8b34999e-efa1-4114-9747-04b0e9fd9190.png?resizew=160)
(1)证明:
;
(2)求平面
与平面
夹角的余弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a9ad711b25c36dae0c2a2cedff9954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8b1a2760333f3d6f6d456881115498.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a6c6fd000370ee69bcadc1023f4eb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e0085cfa2704c321473815818f934d.png)
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【推荐2】如图所示,在三棱锥
中,
平面
,点
分别在棱
上,满足
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/145612d4-8cf7-4887-9b61-2b3bce66a4ba.jpg?resizew=305)
(1)求实数
的值;
(2)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/145612d4-8cf7-4887-9b61-2b3bce66a4ba.jpg?resizew=305)
(1)求实数
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(2)若
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