如图,在直三棱柱ABC﹣A1B1C1中,AB⊥BC,AA1=AC=2,BC=1,E,F分别是A1C1,BC的中点.
![](https://img.xkw.com/dksih/QBM/2021/4/3/2691745387814912/2808754837872640/STEM/f8eab5d6-37b4-4543-8366-a990a3811684.png?resizew=204)
(1)求证:C1F
平面ABE;
(2)求三棱锥A﹣BCE的体积.
![](https://img.xkw.com/dksih/QBM/2021/4/3/2691745387814912/2808754837872640/STEM/f8eab5d6-37b4-4543-8366-a990a3811684.png?resizew=204)
(1)求证:C1F
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)求三棱锥A﹣BCE的体积.
20-21高一下·广西·阶段练习 查看更多[4]
广西钦州市第四中学2020-2021学年高一(体艺班)3月份考试数学试题青海省海南州中学2021-2022学年高二上学期第一次月考数学(文)试题青海省海南州中学2021-2022学年高二上学期第一次月考数学(理)试题(已下线)8.5 空间直线、平面的平行(精练)-2021-2022学年高一数学一隅三反系列(人教A版2019必修第二册)
更新时间:2021-09-15 18:09:15
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解答题-证明题
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适中
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解题方法
【推荐1】如图,正三棱柱
中
为
的中点.
(1)求证:
;
(2)若点
为四边形
内部及其边界上的点,且三棱锥
的体积为三棱柱
体积的
,试在图中画出
点的轨迹,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f483efe20e417feea022e19e1c13020.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176117b9db64a7ab40048c1ac2f442a9.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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适中
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解题方法
【推荐2】如图,在四棱锥
中,
,底面
为菱形,
,
,点
为
的中点,点
在
上,直线
平面
.
(1)确定点
的位置,并证明;
(2)若四棱锥
的体积为
,求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1328e05d150f86dbe18656662eaa8f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/59d9a86f-bd44-47ed-b25f-ca3d49dd9a06.png?resizew=208)
(1)确定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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【推荐1】如图,四棱锥
中,底面
是梯形,
,
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,M为边PC的中点.
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/021b2372-3806-494e-8fdd-c9371490cf00.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55d609d417f8ecc01b5309edff6ecfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8db2bec6ebe672e8f83f24e9bdf4654.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,平面
平面
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为直角梯形,且
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/07d909d4-5052-4cd8-b09a-e32cdda91cb8.png?resizew=168)
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的中点,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
平面
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(2)若平面
与平面
的夹角的余弦值为
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/07d909d4-5052-4cd8-b09a-e32cdda91cb8.png?resizew=168)
(1)若点G为线段
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(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233015062824e26bf4b6a755c428dcae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b35e0243c8f87e44811d85776ea91c.png)
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解答题-证明题
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(0.65)
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解题方法
【推荐3】如图,在四棱锥
中,
,
,
,平面
底面
,E和F分别是
和
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![](https://img.xkw.com/dksih/QBM/2022/5/3/2971517450846208/2971545760194560/STEM/53d2dae28bff40e29149e4c74aced34f.png?resizew=270)
(1)
平面
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(2)
平面
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
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