如图,在三棱锥
中,
.若
,
,
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11563a212b7a41c1488bb5be29746e5d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f9b4bb33-662c-403d-b9d1-a5f63acb6c29.png?resizew=180)
(1)证明:平面
平面ABC;
(2)若
,
,
,试问在线段SC上是否存在点D,使直线BD与平面SAB所成的角为
.若存在,请求出D点的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b158008f4d31d67969baf9bf66dd99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a3906bf8ae240ab81909be62f4d7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16797f413d1c9ba466835d1057370fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c72874ee88b7cb0182a1406390389d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11563a212b7a41c1488bb5be29746e5d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/f9b4bb33-662c-403d-b9d1-a5f63acb6c29.png?resizew=180)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1f08c7640e62e8717abf4d44a6c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841c4de47727d62aa60a33530bb6d958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71ce585c2c7fe3f1e7cab28cba03989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
2021·江西·模拟预测 查看更多[3]
江西省名校2021届高三上学期第二次联考数学(理)试题(已下线)专题09 立体几何(测)-2021年高考数学二轮复习讲练测(新高考版)(已下线)专题08 空间向量在立体几何中的应用-备战2021年高考数学二轮复习题型专练(新高考专用)
更新时间:2020-12-06 18:35:39
|
相似题推荐
【推荐1】如图,在三棱柱
中,
平面
,
,
.
(1)证明:平面
平面
;
(2)若四棱柱
的体积为
,求该三棱柱的侧面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/171429a1afe5bb4ee4cb811af61b1365.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3a59d7bf91a7540e35ce0011ad9b97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)若四棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a852324bf12dd09be665571973c19740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/6c99d6e6-b668-43ce-b0cf-7ae92dba823d.png?resizew=178)
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(0.65)
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解题方法
【推荐2】如图,四边形
中,满足
,
,
,
,
,将
沿
翻折至
,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/f3593f6a-5137-4475-866e-a032523400e4.png?resizew=352)
(1)求证:平面
平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/f3593f6a-5137-4475-866e-a032523400e4.png?resizew=352)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,平面
平面MCD,底面ABCD是正方形,点F在线段DM上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/0a513505-dff3-4b9d-a70d-a4be482afce6.png?resizew=162)
Ⅰ
证明:
平面ADM;
Ⅱ
若
,
,且直线AF与平面MBC所成的角的余弦值为
,试确定点F的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5593f5da367f0cfed66c77c8db9acc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3b5525474f43931ae54f29eade3e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6475141c913c4450807b7c338d45fc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/0a513505-dff3-4b9d-a70d-a4be482afce6.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5774916070f53524538f5fa9aa7b98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7774ff75a02f37928c554d0db2586af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7aef79a09a1089d46c58636724fd9c.png)
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解答题-证明题
|
适中
(0.65)
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【推荐2】如图,已知梯形
中,
,
,
,四边形
为矩形,
,平面
平面
.
(1)求证:
平面
;
(2)求平面
与平面
所成二面角的正弦值;
(3)若点
在线段
上,且直线
与平面
所成角的正弦值为
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee90881c743e2cff2e3128d6bdb86174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1e2c273d6413383af978b52b1cd64f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ea464a0929a33bedd2ee95cdb66ba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f44f2b2f82a9126223138972850aa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1694e2395aef476b9952f92ca72ba56f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/746ee67d-ad9d-44d0-b2e4-8a55489201d7.png?resizew=128)
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