如图,在多面体
中,
两两垂直,四边形
是边长为
的正方形,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/e6d9b1d2-0dd3-4f27-9978-d25db7336be7.png?resizew=159)
(1)证明:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1e1ab067de809e8ab8880ef20eef21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83680a9b9a9526f75e0b37aa532132f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0cb3d3dc19a5457207bffc583cda2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd6ae694a4678178afc4439cc7608f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b20cd1a43264e4533d4980c99fdad4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/e6d9b1d2-0dd3-4f27-9978-d25db7336be7.png?resizew=159)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb10d645970e5860afd3430957fab6c.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
更新时间:2021-09-21 23:39:32
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图所示,已知平行四边形
和矩形
所在平面互相垂直,
,
,
,
,
是线段
的中点.
![](https://img.xkw.com/dksih/QBM/2021/2/25/2665748692049920/2669084851519488/STEM/5201c1b0-924e-4afc-86d3-bb6a1d83bec6.png)
(1)求证:
;
(2)求直线
与平面
所成角的余弦值;
(3)设点
为一动点,若点
从
出发,沿棱按照
的路线运动到点
,求这一过程中形成的三棱锥
的体积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.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/9c161375e4e6f61f1cbef8083c02e975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/2/25/2665748692049920/2669084851519488/STEM/5201c1b0-924e-4afc-86d3-bb6a1d83bec6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b87b3be10408261827291574434d8e.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d0f06dc829e758727c532c608200f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d68be8df235af30390bc3d7b8195e2.png)
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解答题-证明题
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解题方法
【推荐2】如图所示,
是
的直径,点
在
上,
是
所在平面外一点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/98f5d190-c78a-4c43-9db4-498bc51dc440.png?resizew=192)
(1).求证:
平面
;
(2).若
是边长为6的正三角形,
,且
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/98f5d190-c78a-4c43-9db4-498bc51dc440.png?resizew=192)
(1).求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6748d9b9948485c5ba87ca8751c6e053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2).若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90da62f1614568a0b1e5e47ea85e7e3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e749d4e67d0a2dcb44829c79dd58c22.png)
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【推荐1】如图,在四棱台
中,
平面
.底面
是平行四边形,
,
,连接
、
,设交点为
,连接
.
(1)证明:
;
(2)若
,且二面角
大小为60°,求三棱锥
外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddbb0422a136f45653c8c369f2d75fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a70704be2a2ac7bee6865ed51fe8fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172e5fbd9df8b19e0786fad909d36d63.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/b8ba545b-2093-41e2-8e24-216234d7a43f.png?resizew=178)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27bad0636a087e38bb1d253d66a231d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6997af36a239195f7b55557242cb03c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95591ee02fbdff38562a8e7a60a2ffd3.png)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,已知矩形
中,
,点
是
的中点,将
沿
折起到
的位置,使二面角
是直二面角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/352be87d-d877-488e-99df-ef8d9ae96a39.png?resizew=176)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f80f51c31583fea58fde645474d60b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1a2dbe2665ec6a0fadff8e19da12f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f640a822f3410f75cda7b8ea4ee05376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac25fb7c73842ffa94f487a737074d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/352be87d-d877-488e-99df-ef8d9ae96a39.png?resizew=176)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48de407ade331bb86b6343696bd5a55e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d99ecfa8dabb812e134aec7f611189a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27196105c8f8c24e9a1fed180d09606f.png)
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解答题-证明题
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解题方法
【推荐1】如图,三棱柱
的所有棱长都是
,
平面
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/5eee3bbc-bbf4-4c53-8e40-4ad1615c05c8.png?resizew=181)
(1)求证:平面
平面
;
(2)在线段
(含端点)上是否存在点
,使点
到平面
的距离为
,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/5eee3bbc-bbf4-4c53-8e40-4ad1615c05c8.png?resizew=181)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036a0d3b3c70d41060bc441ddd8003fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
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解题方法
【推荐2】如图,在长方体
中,底面ABCD是边长为2的正方形,
,E,F分别为AB,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/3ff76526-5e26-4fd6-8891-23b1eef72d11.png?resizew=155)
(1)证明:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/3ff76526-5e26-4fd6-8891-23b1eef72d11.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a98287a302228ece1fa53c5c66c590f.png)
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