如图,已知三棱柱
,
,
,
为线段
上的动点,
.
(1)求证:平面
平面
;
(2)若
,
为线段
的中点,
,求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1c13645081be951f709fa743a65084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa142bb96af98b846997e681609739f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/5/907af760-a04d-4d98-8499-425ee1e3b410.png?resizew=146)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02864602e30b261c2de2fffb52193a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dc39e2113669164b4894c2ef739f0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cdc08e1c4a04a18d5ecea03393e36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
更新时间:2023-06-02 16:41:52
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,四棱锥
中,底面
为矩形,
,
,
平面
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/c0de9e2c-1923-43ad-a622-6c6e5f8ce8e3.png?resizew=184)
(1)证明:
平面
;
(2)若三棱锥
的体积为
,求直线
与平面
所成角的正切值;
(3)在第二问的条件下,若
为线段
中点,
为线段
上的动点,平面
与平面
是否互相垂直?如果垂直,请证明;如果不垂直,请说明理由.
![](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/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/c0de9e2c-1923-43ad-a622-6c6e5f8ce8e3.png?resizew=184)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(3)在第二问的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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解答题-证明题
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适中
(0.65)
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【推荐2】如图,在三棱锥A—BCD中,
BCD是边长为4的正三角形,AB=5.E为BC的中点,平面ADE⊥平面BCD,三棱锥A-BCD的体积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fef281d932333aa5e3f81cc15d752ec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/448c94d9-eba5-449a-850b-edae6fc03cb5.png?resizew=154)
(1)求证:平面ADE⊥平面ABC;
(2)求二面角C-AD-B的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fef281d932333aa5e3f81cc15d752ec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/448c94d9-eba5-449a-850b-edae6fc03cb5.png?resizew=154)
(1)求证:平面ADE⊥平面ABC;
(2)求二面角C-AD-B的余弦值.
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解答题-证明题
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适中
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【推荐3】如图,在四棱柱
中,四边形
为菱形,四边形
为矩形,
,
,
,二面角
的大小为
,
分别为BC,
的中点.
(1)求证:
;
(2)求直线
与平面BCN所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131c735c1736250c608af9f0d2d185fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9977da109ae8644f94b286ccded8cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/c1a3264e-317e-4b6e-89d0-be06cab5285c.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598dc6b5a7737df67f6df097da7866b0.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
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解答题-证明题
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适中
(0.65)
【推荐1】已知三棱锥P-ABC中,PA⊥ABC,AB⊥AC,PA=AC=½AB,N为AB上一点,AB=4AN,M,S分别为PB,BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/c8f868d1-4d8a-49a0-a1ff-141e81e6cca5.png?resizew=155)
(Ⅰ)证明:CM⊥SN;
(Ⅱ)求SN与平面CMN所成角的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/c8f868d1-4d8a-49a0-a1ff-141e81e6cca5.png?resizew=155)
(Ⅰ)证明:CM⊥SN;
(Ⅱ)求SN与平面CMN所成角的大小.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在四棱锥
中,平面
平面
,E为
的中点,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/29/2883193170640896/2883521596432384/STEM/596ba4d1-9a04-48d5-9a73-fc59119e86a5.png?resizew=214)
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)在线段
上是否存在点M,使得
平面
?若存在,求出点M的位置;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](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/db27b7f29d7d01b2692f217bc3079fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b29d66044d614bc0ce7950ad0a931cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2667ef2f661c8e3b0ef2c3e96892495f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2883193170640896/2883521596432384/STEM/596ba4d1-9a04-48d5-9a73-fc59119e86a5.png?resizew=214)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0457394ce4f2dc8d940c565c94dcf557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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