如图,在四棱锥
中,底面
是边长为1的菱形,其中
,
平面
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/7bfc47b0-5515-45ea-9251-c7a6c7920401.png?resizew=175)
(1)求证:直线
平面
;
(2)求异面直线
与
所成角的大小.
![](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/0434c0177ca5c88ec129bd4cc13f4a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92fd5389b546fe1c72c01fd514f4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ccd2c4b9ef8b0b42ab92635adf7e4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/7bfc47b0-5515-45ea-9251-c7a6c7920401.png?resizew=175)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
17-18高二上·山西·阶段练习 查看更多[5]
更新时间:2021-07-26 23:36:16
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相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在四棱锥
中,底面
是边长为
的正方形,
底面
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/e06af038-c0d6-4f82-a5ae-8b0a2ef5f140.png?resizew=169)
(1)求异面直线
与
所成角的大小;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a5faf3cbb633fc4294c8ce703c64c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129d17c9a49272d44a0e70346414d12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4317430d5a2b61d9a2a88b73e7d7ad39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/e06af038-c0d6-4f82-a5ae-8b0a2ef5f140.png?resizew=169)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
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【推荐2】在解决建筑设计时,一名工程师将实际问题的条件数学化后,问题变为:已知角
,且
,需要求
的最小值.请你帮助工程师判断
是否有最小值;如果有,则采用什么方法解决该问题?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78aeda779b6b4ab348afa33f42fcdab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cd711dbf7586c9fdf17aeab3715cfda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37569e94a79a4bf1f9270617a20d706c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52b4f24969673c863b5aff4fb6751ce.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱锥
中,底面
是边长为2的正方形,
,点M是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/1927de31-1d7f-4f5e-b589-d6565d1213d3.png?resizew=216)
(1)求证:
平面
;
(2)已知
,求三棱锥
的表面积.
![](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/65b0de5237c88a9bfffc207bab17191a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/1927de31-1d7f-4f5e-b589-d6565d1213d3.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af68a7bf0da4f7c6f739d2e2461ad9b7.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135756baa58bc7e02a9df996aac9eaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图所示的长方体
中,底面
是边长为
的正方形,
为
与
的交点,
,
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/c4c0dc5bdad147c188be90a2fe352233.png)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/a4625ff0e63344738c1115e0413ad10c.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/367ae09227b44c2c805c556040db89a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/072f6d1b7a814b5f8694a4014f3b304d.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/b5496cf7f1794d58969f0b16feaa0204.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/4b44a9eea3da451fad75ae7fbab320e5.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/b119ee960e2b4e6ab783f5412fa24654.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/ad2e74fad5af46c194b6c703b014e274.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/8f50f64be8ff48b3a262d73f51fa7f66.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/c4c0dc5bdad147c188be90a2fe352233.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/edc67707ab0848be88102a2869007e39.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/7580a52f8fcf48e2afb2a019198df8fa.png)
(2)求三棱锥
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259719913472/STEM/565c676a00cf478294b59718e8c686c2.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图,在三棱锥
中,
是点
在平面ABC上的投影,
,
,
是BD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/c6883d99-9b95-4310-b174-8d75c378b5ed.png?resizew=202)
(1)证明:
平面DAC;
(2)若O点正好落在
的内角平分线上,
,
,
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c48119b3932497634478f656c752ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/c6883d99-9b95-4310-b174-8d75c378b5ed.png?resizew=202)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280247d7df395bb9ea78c51e67b458d2.png)
(2)若O点正好落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ed04c4ea1abe97c7dd2f3e95dc0eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441a92c002129b752085f041139e2e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bae5203f4b4acf23779114b3466e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a7841fca64062a1f2112de9e696921.png)
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