名校
解题方法
1 . 如图,在直三棱柱
中,
,
分别是
和
的中点.
![](https://img.xkw.com/dksih/QBM/2021/5/31/2732958320508928/2788026338263040/STEM/900eca50573a45c6ae69d52fc00e8b7c.png?resizew=187)
(1)求证:
平面
.
(2)若
,
,
,
,求:三棱锥
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/2021/5/31/2732958320508928/2788026338263040/STEM/900eca50573a45c6ae69d52fc00e8b7c.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808418b6874c5eab4feffb27f1ef483c.png)
您最近一年使用:0次
20-21高三下·全国·阶段练习
名校
解题方法
2 . 如图,在四棱锥
中,
平面
底面
是菱形,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6dc927d2-a0bb-4197-8dc6-7f46d4ad4f6e.png?resizew=190)
(1)证明:
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c707f0202ec1aa233e1eeacc7a4587d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c788746155b46628c21709a55a9f86dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/6dc927d2-a0bb-4197-8dc6-7f46d4ad4f6e.png?resizew=190)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36b782955ed364569d63c96e09b2430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8964550c7fc31d982b1534e884ad6f52.png)
您最近一年使用:0次
2021-05-30更新
|
1381次组卷
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6卷引用:内蒙古包头市第四中学2021-2022学年高三上学期期中考试数学(文)试题
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