如图,三棱柱ABC﹣A1B1C1的各个侧面均是边长为2的正方形,O为BC1与B1C的交点,D为AC的中点.求证:
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373519539888128/2374746027180032/STEM/32852796-16ed-407e-9bcb-f6a200c93a68.png)
(1)AB1∥平面BC1D;
(2)BD⊥平面ACC1A1.
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373519539888128/2374746027180032/STEM/32852796-16ed-407e-9bcb-f6a200c93a68.png)
(1)AB1∥平面BC1D;
(2)BD⊥平面ACC1A1.
更新时间:2020-01-11 13:36:04
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【推荐1】如图,在多面体
中,平面
平面
,
平面
和
均为正三角形,
为线段
的中点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
面
;
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3cfd6b6a7e911d10d1a4bed9ca5e749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46a5ce5c10b7a419055abf43764fce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/176385d91d5e29324fce4a932eff6a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9926397d0839f1a02946828dc348a7d.png)
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【推荐2】如图,在三棱柱
中,侧棱
底面
,
,
,
,
分别为棱
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/c8e685c6-502b-43b3-981d-a0466bc159c0.png?resizew=174)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231673dd67ab79d3c5da73904ceade1e.png)
;
(2)若
,
,求三棱锥
的体积;
(3)判断直线
与平面
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/c8e685c6-502b-43b3-981d-a0466bc159c0.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231673dd67ab79d3c5da73904ceade1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50857bcc9b0377b73c2c0f98bae0f0a7.png)
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(3)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
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【推荐1】如图,在棱长都相等的正三棱柱ABC-A1B1C1中,D,E分别为AA1,B1C的中点.
![](https://img.xkw.com/dksih/QBM/2022/2/20/2920728588959744/2935568370106368/STEM/00513f00-cf71-4ba9-a4b0-05667641331c.png?resizew=156)
(1)求证:DE
平面ABC;
(2)求证:B1C⊥平面BDE.
![](https://img.xkw.com/dksih/QBM/2022/2/20/2920728588959744/2935568370106368/STEM/00513f00-cf71-4ba9-a4b0-05667641331c.png?resizew=156)
(1)求证:DE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)求证:B1C⊥平面BDE.
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【推荐2】如图所示,在三棱锥
中,
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/7/13/2505213350199296/2505960263221248/STEM/4f9a02f6b7e042d8bcf835f3e7a536dd.png?resizew=157)
(1)证明:
平面
;
(2)若
为棱
的中点,点
为棱
上一点,且三棱锥
的体积为
,通过计算判断点
的位置.
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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