名校
解题方法
1 . 如图,
平面
,
,
,
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/2020/7/1/2496631591813120/2497174658236416/STEM/7fd386964fc343179628b915987e9c21.png?resizew=290)
(1)求证:
平面
;
(2)求几何体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689c065652544780be8b33ae92cbb6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e06f5742942dc9e10289858a9506398c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e975e7562572d24e6462e774f5fd491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/7/1/2496631591813120/2497174658236416/STEM/7fd386964fc343179628b915987e9c21.png?resizew=290)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9abe6e8d1f4f1e8bdc46ddbae0cd789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd3df0e78cc51865a46aa0ac013bc44.png)
您最近一年使用:0次
2020-07-02更新
|
585次组卷
|
2卷引用:福建省厦门市湖滨中学2020届高三下学期测试数学(文)试题
解题方法
2 . 如图,在三棱锥
中,
两两垂直,
,平面
平面
,且
与棱
分别交于
三点.
(1)过
作直线
,使得
,
,请写出作法并加以证明;
(2)若
将三棱锥
分成体积之比为8:19的两部分(其中,四面体
的体积更小),D为线段
的中点,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d85e07de529364d1dac0b8be28e74da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441a29d8fc12025055bc577e597f8b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/414844edd458857bdfc80bffa61cbf9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc13de8ca48307d011ccbcdde76c74a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4cf23b7d9dce9f8aba03e11444758a4.png)
(1)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3777318aa3fbdee09cfeeea971e8fcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4794eee351d99fd093324973a87ae7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a49d7f01692ba3b1bd08dcabc7faee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2f3c01bd50dfb12e50107bc7f00c036.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b608ac8c1cd8f774c5ce066891919fed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d041feacf189306d130f4a949880bfc8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/a5c380bb-b312-4101-a539-7c2d877f2316.png?resizew=202)
您最近一年使用:0次
2018-05-22更新
|
245次组卷
|
3卷引用:【全国校级联考】福建省百校2018届下学期临考冲刺高三数学考试卷数学文科
解题方法
3 . 三棱锥
中,侧面
底面
,
是等腰直角三角形
的斜边,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/c7392f81-94fb-4468-856f-b2cf6ff7c6ee.png?resizew=191)
(1)求证:
;
(2)已知平面
平面
,平面
平面
,
,且
到平面
的距离相等,试确定直线
及点
的位置(说明作法及理由),并求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6e6192cf24ada791c26c2d6d434069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2c26fdaf938bf39a43ce6c647e7813.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/c7392f81-94fb-4468-856f-b2cf6ff7c6ee.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e7c18f9db65fcd840b39d7bbd3028c.png)
(2)已知平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03cc02a6d6b1371171d40e4b0de06ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/670684ed4962fcebce7b5a140510d066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd6f80993ce27b2619335e0d83bec57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c553d00f2fe91456c8284e0a2887ddfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c29a7e8eea08197bf53164a560bee58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d535bfd65eb04a29d64425d54b2acf86.png)
您最近一年使用:0次