如图,在正方体
,中,H是
的中点,E,F,G分别是DC,BC,HC的中点.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/95825610-2015-4579-ae45-e724b0753250.png?resizew=222)
(1)证明;F,G,H,B四点共面;
(2)平面
平面
﹔
(3)若正方体棱长为1,过A,E,
三点作正方体的截面,画出截面与正方体的交线,并求出截面的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/95825610-2015-4579-ae45-e724b0753250.png?resizew=222)
(1)证明;F,G,H,B四点共面;
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de22059d7d80f24817235269e9bb1ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
(3)若正方体棱长为1,过A,E,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
22-23高一下·山东临沂·期中 查看更多[2]
更新时间:2023-06-07 09:35:11
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相似题推荐
解答题-问答题
|
适中
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解题方法
【推荐1】如图,在直三棱柱
中,点
、
在侧棱
、
上,且
,
,点
、
在线段
、
上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/fad6f9c8-1f1c-42fa-92f9-8e826a435629.png?resizew=139)
(1)证明:点
在平面
内;
(2)若
,
,
,求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1acab2d6fecadbf4375936e8a2176540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1890aa7b375e3a8f8f8a0f36cf5deca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7289ef8051c49b4089836bac6f70b4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb73061827c2685d3f7603485c120ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/fad6f9c8-1f1c-42fa-92f9-8e826a435629.png?resizew=139)
(1)证明:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebce46aeb97373353179e5669365fa4a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883fc5e3faf39829d60804b59deb1730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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【推荐2】如图,四棱柱
的侧棱
⊥底面ABCD,四边形ABCD为菱形,E,F分别为
,
的中点.
(1)证明:
四点共面;
(2)若
,求点A到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/23/433a813c-df7d-4865-9621-2330ada6a962.png?resizew=171)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5cbd49398ea07b78a29bad53ce473d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a13c87c4a9b207b179170fce52bec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6069dc466eec75bbeb3d5c9b51cb3a70.png)
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【推荐3】如图,正方体
的棱长为2,点
在棱
上,点
在棱
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/37ba6659-9aeb-4206-9266-4770a1227143.png?resizew=379)
(1)若
(如图1),求证:B、F、
、E四点共面;
(2)若
为
的中点,过B、E、F三点的平面记为
,平面
与棱
相交于G点(如图2),平面
将正方体分割所成的.上下两个部分的体积分别为
、
,若
,求平面
与平面ABCD所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/37ba6659-9aeb-4206-9266-4770a1227143.png?resizew=379)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab9bc16d230169b389443609ea01f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0fa96f3bd125df437ce1d83400d3ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解题方法
【推荐1】如图,长方体
中,
,
,点E,F,M分别为
的中点,过点M的平面
与平面
平行,且与长方体的面相交,则交线围成的几何图形的面积为(不必说明画法与理由)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37750daa8ba3b3fe3e9e2092f81c848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/295aced98768ce261e00fe6660a427a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b20b67320cadf8396e6895781586780e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/069acffe-e30f-4190-8576-6912180e8826.png?resizew=164)
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解答题-作图题
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【推荐2】如图,正方体
的棱长为1,点
在棱
上,过
,
,
三点的正方体的截面
与直线
交于点
.
![](https://img.xkw.com/dksih/QBM/2021/4/17/2701872321519616/2702437407539200/STEM/8c8791a4759147a2946a0da12426de3c.png?resizew=291)
(1)找到点
的位置,作出截面
(保留作图痕迹),并说明理由;
(2)已知
,求
将正方体分割所成的上半部分的体积
与下半部分的体积
之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2021/4/17/2701872321519616/2702437407539200/STEM/8c8791a4759147a2946a0da12426de3c.png?resizew=291)
(1)找到点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b45ff172cc611ca501688d9dc0175b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
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【推荐1】如图所示的多面体中, AC⊥BC,四边形ABED是正方形,平面ABED⊥平面ABC,点F,G,H分别为BD,EC,BE的中点,求证:
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378134618562560/2378375914545152/STEM/8449ed927b4e4f97b83a872471880cfe.png?resizew=113)
(1) BC⊥平面ACD
(2)平面HGF∥平面ABC.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378134618562560/2378375914545152/STEM/8449ed927b4e4f97b83a872471880cfe.png?resizew=113)
(1) BC⊥平面ACD
(2)平面HGF∥平面ABC.
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【推荐2】如图,在矩形
中,
,
,
平面
,
分别为
的中点,点
是
上一个动点.
![](https://img.xkw.com/dksih/QBM/2017/12/14/1838504801681408/1840389586018304/STEM/af3fd602-59cb-43b2-9816-1733d58af966.png)
(1)当
是
中点时,求证:平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
平面
;
(2)当
时,求
的值.
![](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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e13dcc51cd3a901cf25bd3c0d23588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2017/12/14/1838504801681408/1840389586018304/STEM/af3fd602-59cb-43b2-9816-1733d58af966.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262b958cb704607cd5c0a92253de258e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31904028b0e9284d0887be294bbd8add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c171fedd2b659c8b735c9ba2a501821.png)
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