(文科选做)如图,在棱长为1的正方体ABCD-A1B1C1D1中,点E、F分别是棱BC,CC1的中点,P是侧面BCC1B1内一点,若A1P∥平面AEF,则线段A1P长度的取值范围是_____ .
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854393813458944/1855248173891584/STEM/a74a1b3819c3454488e88957729ecdb5.png?resizew=144)
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854393813458944/1855248173891584/STEM/f521fc36f4d941449c354c0a7dc17666.png?resizew=137)
(理科选做)在正方体ABCD-A1B1C1D1中,点E为BB1的中点,则平面A1ED与平面ABCD所成的锐二面角的余弦值为________ .
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854393813458944/1855248173891584/STEM/a74a1b3819c3454488e88957729ecdb5.png?resizew=144)
![](https://img.xkw.com/dksih/QBM/2018/1/6/1854393813458944/1855248173891584/STEM/f521fc36f4d941449c354c0a7dc17666.png?resizew=137)
(理科选做)在正方体ABCD-A1B1C1D1中,点E为BB1的中点,则平面A1ED与平面ABCD所成的锐二面角的余弦值为
17-18高二上·江苏·期中 查看更多[2]
更新时间:2017-11-15 20:54:17
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【推荐1】如图所示,正方体
的棱长为1,
分别是棱
,
的中点,过直线
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平面
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②直线
∥平面
始终成立;
③四边形
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④四棱锥
的体积
为常数;
以上结论正确的是___________ .
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②直线
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(2)若点
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【推荐2】如图,在棱长为1的正方体
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③
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②对任意点P,都有
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