如图,在四棱锥
中,底面
直角梯形,
∥CD,
,
平面
,
是棱
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/994db2c8-035d-4a09-8898-e271a301c69b.png?resizew=191)
(1)证明:平面
平面
;
(2)已经
,
,若
分别是
的中点,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/994db2c8-035d-4a09-8898-e271a301c69b.png?resizew=191)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)已经
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ada4b1a1df7f0959222d971f928c392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829a1a887ceba13dd8551b1e3604bf6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
19-20高三下·湖南长沙·阶段练习 查看更多[7]
更新时间:2020-04-20 19:15:27
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,三棱柱
中,侧面
是菱形,其对角线的交点为
,且
,
.
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879143721811968/1879886932148224/STEM/0ef2e1c65caa4a70b73cb342424d052a.png?resizew=209)
⑴ 求证:
平面
;
(2)设
,若三棱锥
的体积为1,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d31a4ddb10768e9e7868d0c34c425f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870cee007535b979d35bc7feab75616.png)
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879143721811968/1879886932148224/STEM/0ef2e1c65caa4a70b73cb342424d052a.png?resizew=209)
⑴ 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9aee65cea80e8f45ad95b8960b7c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6c78cf8efa150c87d580cacf0063ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd06851d747f8ccf046bc807b2523e65.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】斜三棱柱ABC﹣A1B1C1,已知侧面BB1C1C与底面ABC垂直且∠BCA=90°,∠B1BC=60°,BC=BB1=2,若二面角A﹣B1B﹣C为30°
(1)求AB1与平面BB1C1C所成角的正切值;
(2)在平面AA1B1B内找一点P,使三棱锥P﹣BB1C为正三棱锥,并求P到平面BB1C距离.
(1)求AB1与平面BB1C1C所成角的正切值;
(2)在平面AA1B1B内找一点P,使三棱锥P﹣BB1C为正三棱锥,并求P到平面BB1C距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/89ccdfe0-4e80-4864-a93f-d81c2ff54ae9.png?resizew=172)
您最近一年使用:0次
【推荐1】如图,在四棱锥
中,
两两相互垂直,
为
的中点,且
.
(1)证明:平面
平面
;
(2)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96acc5137898f9c1f11960ac0dca25ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019ce94774e57cefaadfc2e02bd2ea26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2099bdf3153028f1502d3e14ed3dec3d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/d1064adf-e006-4060-b4d3-3b04cf4e3539.png?resizew=153)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3559df13766ca6e72ab355be51c93804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d24703c6de41c2df507d5405f377ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在空间四面体
中,
⊥平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084641414602752/2086573145333760/STEM/e80fe799325745ed86d7676656eb6b7d.png?resizew=263)
(1)证明:平面
⊥平面
;
(2)求四面体
体积的最大值,并求此时二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc060366fff50795ac657153653117e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a958cb1de7e893d6a9384995c0c60a84.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084641414602752/2086573145333760/STEM/e80fe799325745ed86d7676656eb6b7d.png?resizew=263)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ca12f11f39405a6a49042c5e294862.png)
您最近一年使用:0次