如图,平行四边形
中,
,
,
,
,
分别为
,
的中点,
平面
.
![](https://img.xkw.com/dksih/QBM/2017/5/12/1685651820625920/1686319385862144/STEM/b5155c6affa04ecbbb9830ed6ac12edf.png?resizew=145)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1391573c30964b87ca3429bf67ae22aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db27b7f29d7d01b2692f217bc3079fc4.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425bb0d1c21eb4448dbbe9a41efa7538.png)
![](https://img.xkw.com/dksih/QBM/2017/5/12/1685651820625920/1686319385862144/STEM/b5155c6affa04ecbbb9830ed6ac12edf.png?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb4c17acd5f41213dfea07dd2e5a95c.png)
更新时间:2017-05-13 22:08:29
|
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】若一个三棱锥的三个侧面中有两个是等腰直角三角形,另一个是边长为
的正三角形,试求所有满足上述条件的三棱锥的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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解答题-证明题
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适中
(0.65)
【推荐2】已知平面四边形
,
,
(如图1所示),现将
沿
边折起,使得平面
平面
,点
为线段
的中点,
为线段
上一点,(如图2所示).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/626f0ceb-0a28-43c0-8acd-512bf367ef0c.png?resizew=243)
(1)求证:
平面
;
(2)若二面角
的余弦值为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625bca170fed3fbdc1441b3c0df4a6bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389df3a1b8b7c1b0a4296655c56ee33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/626f0ceb-0a28-43c0-8acd-512bf367ef0c.png?resizew=243)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2b4e753ef119608188c46a50ec597e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9905491a66a3ee51536b204970ff7c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e468f168f3657d84d44be5eb89a62d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab735cbfb3c34c9e36ee059bca5ecdf.png)
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名校
【推荐3】如图,在四棱锥P−中,底面ABCD为正方形,侧面ADP是正三角形,侧面ADP⊥底面ABCD,M是DP的中点.
(1)求证:AM⊥平面CDP;
(2)求直线BP与底面ABCD所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/d5e41997-9494-4029-b88f-fa7330b1a792.png?resizew=160)
(1)求证:AM⊥平面CDP;
(2)求直线BP与底面ABCD所成角的正弦值.
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解题方法
【推荐1】如图,在四棱锥
中,四边形
是平行四边形,
,
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/41aca97d-1b92-4d1b-8cb1-df7441ee5c8e.png?resizew=168)
(1)求证:
平面
;
(2)直线
与平面
所成角的正切值为
,求四棱锥
的体积;
![](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/9357bea6dcc9ec7590e4d769c041bf7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/41aca97d-1b92-4d1b-8cb1-df7441ee5c8e.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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解答题-证明题
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适中
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【推荐2】已知在四棱锥
中,底面
是矩形,
平面
,
,
,
分别是
的中点.
(Ⅰ)求证:
平面
;
(Ⅱ)求
与平面
所成角的正切值;
(Ⅲ)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a4b8b69b419c557ba61a2bdfaf4066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/1cbe8961cca9440ea334ee049d109146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac4ee9a98647379757a6f643fb73438.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d44d4c3e7a31adda586ccb1f3c12109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf12905647aeeded72bbca21a63f319.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(Ⅲ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc577b6dc341c90c994552b41a4f613c.png)
![](https://img.xkw.com/dksih/QBM/2011/3/29/1570083768958976/1570083773898752/STEM/d88f1b2553354ff688373071631721de.png?resizew=336)
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3】如图,在正方体
中,
是
的中点,
是
内部或边界上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/c7067edd-53c7-4610-aa6e-4a4f62c3471f.png?resizew=162)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a0c3a4e61b97fa9bc58f3179fc2958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8385e82b5db466dbec438443a39934cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/c7067edd-53c7-4610-aa6e-4a4f62c3471f.png?resizew=162)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29953579af8f8458bd3be0d75491da4f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29953579af8f8458bd3be0d75491da4f.png)
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