如图,在四棱锥
中,平面
平面
,O,M分别为线段AD,DE的中点.四边形BCDO是边长为1的正方形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/dd5505f2-3c1e-47da-9762-c25312d96667.png?resizew=178)
(1)求证:
平面ABE;
(2)求直线DE与平面ABE所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5427b7b994b860628df3d6b7a07de8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/dd5505f2-3c1e-47da-9762-c25312d96667.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0684e0b09b04661c602437982c0397.png)
(2)求直线DE与平面ABE所成角的正弦值.
更新时间:2021-08-26 16:24:29
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相似题推荐
解答题-证明题
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解题方法
【推荐1】直三棱柱
中,
为正方形,
,
,M为棱
上任意一点,点D、E分别为AC、CM的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/53ef0522-8a05-438d-90ad-7c82c2c8030c.png?resizew=181)
(1)求证:
平面
;
(2)当点M为
中点时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/53ef0522-8a05-438d-90ad-7c82c2c8030c.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75aea24647cd4d0b4b9aa513bf5457b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)当点M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4711ea198eebe0a72ef2c66a9dd51b83.png)
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解题方法
【推荐2】判断下列命题是否正确,并说明理由:
(1)若
,
,则
;
(2)若
,
,则
;
(3)若
,
,
,则
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35a45cfcdfbda18b089ce6698ccdbcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b82e5d28e2e5a4790e94db2daa6a07c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384a65ca1ee3d7d86b988ca34c885e18.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b82e5d28e2e5a4790e94db2daa6a07c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35a45cfcdfbda18b089ce6698ccdbcd.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a793cf00839bd42703a12c07171422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22a7b0f6c7ed3062b8f7447542cba7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42b3cc871181e5e74f640186658804fb.png)
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解答题-证明题
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【推荐3】如图,
四边形是矩形,
平面
,
,
是
上的一点.
![](https://img.xkw.com/dksih/QBM/2021/8/13/2785290337861632/2786879780028416/STEM/294bf947d3ed4b8899928152eb4e0c1d.png?resizew=181)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d5c86d05675a0de42019ee74ca131f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2021/8/13/2785290337861632/2786879780028416/STEM/294bf947d3ed4b8899928152eb4e0c1d.png?resizew=181)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810ee7bc82b6f452afb3fc18691abc3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
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【推荐1】如图,在正四棱柱
中,
.点E,F,G,H分别在棱
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/cc3d4739-9c86-444f-bb35-a421b503434a.png?resizew=113)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed5e5d514bba98dbd038d0857a34ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360a93b9662f0ab8a69b131497520b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bb3bb65447a6d1c8d2891d9c8f8bdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/cc3d4739-9c86-444f-bb35-a421b503434a.png?resizew=113)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5c87a4eeba6042558a1a7cc31b5c1d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6917095bea8efd3154b72d737f013.png)
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【推荐2】如图,在四棱锥
中,
平面ABCD,
,
,且
,
,M是棱SB的中点.
(2)求点A到平面
的距离;
(3)设N是棱
(含端点)上的动点,求直线
与平面
所成角的大小的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d11dd7422f4703763abc23d83c7584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
(2)求点A到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
(3)设N是棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
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