如图,在正方体
中:
与平面ABCD是否垂直?为什么?
(2)平面
与平面
是否垂直?为什么?
(3)平面
与平面
是否垂直?为什么?
(4)平面
与平面
是否垂直?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(3)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb04914c4e8fb3483da44c67fe1809f.png)
(4)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
20-21高一·全国·课后作业 查看更多[2]
更新时间:2021-11-13 09:36:18
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在四棱柱
中,
,
,
,四边形
为菱形,
在平面ABCD内的射影O恰好为AD的中点,M为AB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/601bf939-26e7-402b-8292-7f5ee7eaaf35.png?resizew=239)
(1)求证:
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30f6595dd643813b11ad71df61a10dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d43dfede0d7e17c2ad89ab51349e6bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/601bf939-26e7-402b-8292-7f5ee7eaaf35.png?resizew=239)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b38b682e2b5a2b6dd202ec99adfce538.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】如图1,在等腰直角三角形
中,
,
,
、
分别是
,
上的点,
,
为
的中点,将
沿
折起,得到如图2所示的四棱锥
,其中
.
![](https://img.xkw.com/dksih/QBM/2018/3/4/1894848057049088/1896483660062720/STEM/6816e746180f4574afbfb482dc227aa5.png?resizew=340)
(1)证明:
平面
;
(2)求二面角
的平面角的余弦值;
(3)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb358ec5fa447d451a182e75238442bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3dfbb6beba0f887919ac213e09d59e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a598d0b531b13ac899c3b6f811f96eb.png)
![](https://img.xkw.com/dksih/QBM/2018/3/4/1894848057049088/1896483660062720/STEM/6816e746180f4574afbfb482dc227aa5.png?resizew=340)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8861419db249a725432a5af2bbdadad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2668ac4a3015646e4aeff623e93db65e.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cefda9b70418eff32d21acc73fd2434.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,
是平行四边形,
平面
,
//
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2017/10/13/1794282516774912/1794471202021376/STEM/9f2bf70c6a4e4510a99b1859f87f1aab.png?resizew=252)
(1)证明:
//平面
;
(2)求证:平面
平面
;
(3)求直线
与平面
所成角的正弦值;
(4)求二面角
的平面角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b5d2943803894bc5d204e75e2d172b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f04edd173055da613832b187737ce4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d31430a87a688a727b86e4001dcb3e6.png)
![](https://img.xkw.com/dksih/QBM/2017/10/13/1794282516774912/1794471202021376/STEM/9f2bf70c6a4e4510a99b1859f87f1aab.png?resizew=252)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd5861601a5e5aaa35dc70b902fd381.png)
(4)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69076a8440ebd8d01106579c7b5bce62.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】在五面体
中,
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453971494592512/2454304669417472/STEM/10b2a85be5c14f6f9d6985e9b3310e7e.png?resizew=271)
(1)证明:平面
平面
;
(2)若
,
是等腰直角三角形,
,求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bdc830e80cb3cb370ef786226ecb65f.png)
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453971494592512/2454304669417472/STEM/10b2a85be5c14f6f9d6985e9b3310e7e.png?resizew=271)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b261d275f89b1b615e0389f7afe2d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1070d38d2fea1dc88c6eb31d320b763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在三棱锥
中,平面
平面
,
是等腰直角三角形,
,O为
的中点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/57e4e5d3-142f-4cf1-a90d-0c19acf47224.png?resizew=166)
(1)证明:
;
(2)在棱
上是否存在点E,使二面角
的大小为
?若存在,求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e035eaa3f4e9a32ab7666e8fe951db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/57e4e5d3-142f-4cf1-a90d-0c19acf47224.png?resizew=166)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01898d4ad9757e07bddd6c26e59d1f9.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324d453870b345da0c41977290192f94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e003ad7604dc766aabcf1f9ec02a3bc.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知正四棱锥
的各条棱长都相等,且点
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/c5524592-c158-46e9-93e1-3149a807c906.png?resizew=180)
(1)求证:
;
(2)若
平面
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8e34f8153f140197ca829398275c88.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/c5524592-c158-46e9-93e1-3149a807c906.png?resizew=180)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90fa715d27ae43ec1e157226bc9dea54.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6295af1afb3c0731e2ce87cbcb7bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e29d57b4d6e7ae4a2b115fd1a5500e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e22577047d263c1ddf9081938520596.png)
您最近一年使用:0次