解题方法
1 . 如图所示,在正方体
中,M是棱
上一点,平面
与棱
交于点N.给出下面几个结论,其中所有正确的结论是( )
①四边形
是平行四边形;②四边形
可能是正方形;③存在平面
与直线
垂直;④任意平面
都与平面
垂直.
![](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/f2b60b2457c371a51698973224606852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
①四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2213cbd7555ee2a50435f9484d963c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cfdc6224181d44e63aab43ddaf07ef.png)
A.①② | B.③④ | C.①④ | D.①②④ |
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解题方法
2 . 如图,三棱锥
中,平面
平面
,
,
,
,
为线段
中点,点
线段
上,点
,
分别在线段
,
上.
![](https://img.xkw.com/dksih/QBM/2021/5/14/2720957629218816/2725681220272128/STEM/38e5a0cd8ea64040b2d2e11a655e5370.png?resizew=231)
(1)若平面
平面
,求线段
的长;
(2)在(1)的条件下,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1334a80265b1fccb36603e620b1f93b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9ee83e4cba2d1da675814c0bbbf822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eede8a5355b8a8d9a9f904fdc1c29253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/14/2720957629218816/2725681220272128/STEM/38e5a0cd8ea64040b2d2e11a655e5370.png?resizew=231)
(1)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78eb0e7bd1ab94d6b3a03756bcbb0e12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(2)在(1)的条件下,求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542fce85d46dbdd033ff723a4181b4a7.png)
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2021-05-21更新
|
804次组卷
|
2卷引用:四川省绵阳市南山中学双语学校2020-2021学年高二下学期6月月考数学(文)试题
名校
3 . 在几何体
中,如图,四边形
为平行四边形,
,平面
平面
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/6/12/2482829342801920/2483328407314432/STEM/2f52fb44d7a54c77b28a313c76f36a0e.png?resizew=148)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/806625a93511075586360d7f9f335f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b860dfa4b838fb65b54eb4be48c2994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de22059d7d80f24817235269e9bb1ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e0bd4b30dc777ac9da80f6baa3eb31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6d336ec41c4da56ccd4ac9e0f977b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e458dd1ce1c8dcdc2becac146d9dc231.png)
![](https://img.xkw.com/dksih/QBM/2020/6/12/2482829342801920/2483328407314432/STEM/2f52fb44d7a54c77b28a313c76f36a0e.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a17158a669a634e3db538ce76471950.png)
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2020-06-12更新
|
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5卷引用:四川省绵阳市2020届高三年级高考适应性考试(四诊)理科数学试题
四川省绵阳市2020届高三年级高考适应性考试(四诊)理科数学试题山东省泰安肥城市2020届高三适应性训练(二)数学试题(已下线)专题19 立体几何综合-2020年高考数学(理)母题题源解密(全国Ⅲ专版)四川省泸州市泸县第四中学2022届高三三诊模拟考试理科数学试题四川省泸州市泸县第四中学2022届高三下学期高考适应性考试数学(理)试题