如图,已知三棱锥
中,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490954796163072/2491496351744000/STEM/6565f4af977740869167dfb8de6a8aee.png?resizew=200)
(1)证明:
;
(2)求直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eebd469dcd6a3b96a4b47215d61d155.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ef5ee4584144baf0e17a12e14efd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c70a167f1f96583de5f623f608f8535.png)
![](https://img.xkw.com/dksih/QBM/2020/6/23/2490954796163072/2491496351744000/STEM/6565f4af977740869167dfb8de6a8aee.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b416412f982d9c6956b2229d6e3729.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
2020·浙江·模拟预测 查看更多[7]
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更新时间:2020-06-24 12:25:12
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,四棱锥
中,
平面
,
,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/b6b3c6f4-94fc-46a3-90e1-f23c3dc78deb.png?resizew=172)
(Ⅰ)证明:
平面
;
(Ⅱ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8d6911eab97f52e844edc9d2e5ee83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/b6b3c6f4-94fc-46a3-90e1-f23c3dc78deb.png?resizew=172)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544381069cb72bed5598ca5adc45ae26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
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解答题-作图题
|
适中
(0.65)
解题方法
【推荐2】(1)如下左图,
,
是平面
的两条斜线段,若直线
,
与
所成角分别为
,
,那么使得
成立的一个充要条件可以是______.
![](https://img.xkw.com/dksih/QBM/2022/9/14/3066353699037184/3066896435642368/STEM/a1d382c7a82445ca8b4d038b467f1283.png?resizew=554)
(2)在上右图中,画出两条平行直线在平面
内的射影的所有可能图形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f64fa38725c136504f723019a18dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93fa313adc4ac7608ba9449fd755212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a795e7831009eebc624bb868d79015.png)
![](https://img.xkw.com/dksih/QBM/2022/9/14/3066353699037184/3066896435642368/STEM/a1d382c7a82445ca8b4d038b467f1283.png?resizew=554)
(2)在上右图中,画出两条平行直线在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在直三棱柱
.
![](https://img.xkw.com/dksih/QBM/2012/3/3/1570786266800128/1570786272321536/STEM/b9e4816b3b1e4b26982286e8887ab949.png?resizew=208)
(1)
分别为
的中点,求证:![](https://img.xkw.com/dksih/QBM/2012/3/3/1570786266800128/1570786272321536/STEM/a68c49cc105d4e6aac7a27b06f026309.png?resizew=12)
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a15e5aa00c64b6dfeab4a8bdc19f0d5.png)
![](https://img.xkw.com/dksih/QBM/2012/3/3/1570786266800128/1570786272321536/STEM/b9e4816b3b1e4b26982286e8887ab949.png?resizew=208)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ef74720bfb958a3ab7a58b88a0bf83.png)
![](https://img.xkw.com/dksih/QBM/2012/3/3/1570786266800128/1570786272321536/STEM/a68c49cc105d4e6aac7a27b06f026309.png?resizew=12)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54f6d01d7cf77c94731dd596e900562.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,在三棱台ABC-DEF中,平面DEBA⊥平面ABC,平面DFCA⊥平面ABC,AB:BE:DE=4:5:1.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/39286f2e-108d-4f55-b103-82e06939ab2a.png?resizew=177)
(1)求证:AD⊥BC;
(2)若△ABC是等边三角形,试问:棱BE上是否存在一点H,使得二面角H-AC-B的平面角为
?若存在,求出
的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/39286f2e-108d-4f55-b103-82e06939ab2a.png?resizew=177)
(1)求证:AD⊥BC;
(2)若△ABC是等边三角形,试问:棱BE上是否存在一点H,使得二面角H-AC-B的平面角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00e3ebf5d28a346cae244c1554b1500.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,直四棱柱
的底面是菱形,
,E,M,N分别是BC,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/6ae5869f-fcc1-40ad-8bdf-842f67d57d8d.png?resizew=178)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa142bb96af98b846997e681609739f.png)
(2)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
平面
;
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19b6bccaa2a17808d1533aa136c17e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3726450efcb4a70c6ffcb611ab58e9e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/6ae5869f-fcc1-40ad-8bdf-842f67d57d8d.png?resizew=178)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa142bb96af98b846997e681609739f.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a463a03c549b0dba6d90e7f16a2af.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f145b8eaf09812b3abb946ab435eb4.png)
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