如图,在直三棱柱
中,平面
侧面
,且
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/617c963d-570f-42ed-8be2-70e96bfd857b.png?resizew=146)
(Ⅰ)求证:
;
(Ⅱ)若直线
与平面
所成角的大小为
,求锐二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae68e55b536a22145547bb15916ec42e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dee56b9f36ba8f76fe67b76383636b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/617c963d-570f-42ed-8be2-70e96bfd857b.png?resizew=146)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
(Ⅱ)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0218542daefa15910d5111b27e71f5b3.png)
2011·山东潍坊·一模 查看更多[6]
(已下线)2011届山东省潍坊市三县高三最后一次模拟考试文数(已下线)2012届山东省莱州一中高三第二次质量检测文科数学试卷【全国百强校】安徽省六安市第一中学2019届高三下学期高考模拟考试(三)数学(理)试题【全国百强校】甘肃省兰州市第一中学2019届高三6月最后高考冲刺模拟数学(理)试题四川省攀枝花市2018-2019学年高二下学期期末数学(理)试题四川省内江市威远中学校2020-2021学年高二下学期第三次月考数学(理)试题
更新时间:2019-06-05 11:01:21
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相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,正方形
的边长为2,
的中点分别为
,正方形
沿着
折起形成三棱柱
,三棱柱
中,
,
.
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848062464098304/2848946913853440/STEM/bcafdf96eae8407383882f1bf499bb99.png?resizew=458)
(1)证明:当
时,求证:
平面
;
(2)若二面角
的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da62d9c339d604c5ffafc82fc54e2b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8239d94c830497c40359d1312ec4b282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564517b02a6a50ff1ef6251d634530f8.png)
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848062464098304/2848946913853440/STEM/bcafdf96eae8407383882f1bf499bb99.png?resizew=458)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d06903252260d31d1a9cdeb735b089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ceb31247add8ca7b0853e801e1d125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac5b7d85cc224776e36a76a4db5d356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在四棱锥
中,平面
平面
,底面
为菱形,
为等边三角形,且
,
,O为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/5e444009-a80a-414d-9087-2fdbc946a3d8.png?resizew=169)
(1)若E为线段
上动点,证明:
;
(2)G为线段PD上一点,是否存在实数
,当
使得二面角
的余弦值是
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c231fb9aeaf4b73c2d835bb4c3d42b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/5e444009-a80a-414d-9087-2fdbc946a3d8.png?resizew=169)
(1)若E为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d26564a3cd8db7262fc41d069682e0b.png)
(2)G为线段PD上一点,是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9247bc3857c75fad272a68dc521399d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ed8243882811858c49f11aa858ff742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解答题-问答题
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解题方法
【推荐1】如图,四边形
是边长为2的菱形,且
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/a0a91b26-8f87-42b8-8535-27526d85eeee.png?resizew=206)
(1)证明:平面
平面
.
(2)求平面
与平面
夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a6cdb5ece9579bf218eabf67a42d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e25264031acace5b12dc480940fffcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4a75a83af80c95c078445ac95538ff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/6/a0a91b26-8f87-42b8-8535-27526d85eeee.png?resizew=206)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec89c4d9a43c9d4f7e0ddcfe0a9360b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8948ac8156d19336083987d47b0f7038.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
您最近一年使用:0次
解答题-问答题
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解题方法
【推荐2】如图,在正方体
中,已知棱长为4,点E,F分别在
,
上,
.
所成角的余弦值;
(2)求直线AE和平面
所成角的正弦值;
(3)求平面
和平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc746366fd02ea4dcecb5a573b2131e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
(2)求直线AE和平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次