如图,在棱长为2的正方体
中,
为
的中点,
为
的中点.
(1)求证:
//平面
;(2)求三棱锥
的体积;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2eb89294b31ffdd2680b4361e8994d7.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb5a463a03c549b0dba6d90e7f16a2af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b635e62c3b1f4a57feac8d22be84ee.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0dbea030ddff17bc48a6d976395c5d.png)
![](https://img.xkw.com/dksih/QBM/2012/2/15/1570739311222784/1570739316727808/STEM/065efb01-7bc0-44b1-84e2-9f1777b0cfb6.png?resizew=162)
12-13高二上·河北唐山·期末 查看更多[1]
(已下线)2011-2012学年河北省唐山一中高二第一学期调研考试数学
更新时间:2016-12-01 15:00:13
|
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适中
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【推荐1】已知
为平面直角坐标系中一点,将向量
绕原点O逆时针方向旋转
角到
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【推荐2】已知向量
,函数
.
(1)求函数
的最小正周期;
(2)若
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的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae5f18dbe8d36dc3326317a4f60c2e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590adcae2d4af0c94641ab3da0666ed7.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb2e49ec8d5b177fe10c0a5bb4000fc.png)
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【推荐1】如图,在三棱锥
中,底面
为等边三角形,
,
,且平面
平面
.
(1)求三棱锥
的体积;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a665ba024f2840ce5aef3765249341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94117be6898f465b621b00d996cea62a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/aefa5dcc-8443-42b9-828b-954d68f291a1.png?resizew=159)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e820aec9c1a975242fe6d76408a9cde8.png)
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解题方法
【推荐2】如图,已知四棱锥
,底面
为菱形,
,侧面
为边长等于2的正三角形,侧面
与底面
所成的二面角为
.
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521508514193408/2522619224391681/STEM/d12c669c-3287-441c-9764-ad6548b17f54.png)
(1)求四棱锥
的体积;
(2)求面
与面
所成二面角的正切值.
![](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/9104a1941e557a85fd1496bc2b9be297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf2d033664f89ef059ac8303622a3bf.png)
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521508514193408/2522619224391681/STEM/d12c669c-3287-441c-9764-ad6548b17f54.png)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
(2)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745e0525a41fe2e2a7739c75a942290b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955e030d649a3c7885071b4bf849993c.png)
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【推荐1】如图,在五边形
中,
,
,
为
的中点,
.现把此五边形
沿
折成一个
的二面角.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/2723dc4c-21ba-48c0-aa87-54043e7a3f58.png?resizew=459)
(1)求证:直线
平面
;
(2)求二面角
的平面角的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfdb1fbc9c88a4b2b0ff45d2d839d186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/2723dc4c-21ba-48c0-aa87-54043e7a3f58.png?resizew=459)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2473be8a4d7292d90f376635490f67ea.png)
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【推荐2】如图,在四棱锥P—ABCD中,已知底面ABCD为矩形,PA
平面PDC,点E为棱PD的中点.求证:
(2)平面PAD
平面ABCD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)平面PAD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
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【推荐1】四棱锥
中,
平面
,四边形
为菱形,
,
,E为AD的中点,F为PC中点.
平面
;
(2)求PC与平面PAD所成的角的正切值;
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求PC与平面PAD所成的角的正切值;
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e867e5c7ef4da37d8985ce82022060e.png)
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适中
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【推荐2】如图,已知在矩形
中,
,
,点
是边
的中点,
与
相交于点
,现将△
沿
折起,点
的位置记为
,此时
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759928229675008/2778072463958016/STEM/824f20886c834ccab119ef187a67a6e3.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759928229675008/2778072463958016/STEM/d7b971a1d70e44a1bf1489b1bb291584.png?resizew=244)
(Ⅰ)求证:
平面
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d30374a2dad85e336ceaa462be7e00e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759928229675008/2778072463958016/STEM/824f20886c834ccab119ef187a67a6e3.png?resizew=151)
![](https://img.xkw.com/dksih/QBM/2021/7/8/2759928229675008/2778072463958016/STEM/d7b971a1d70e44a1bf1489b1bb291584.png?resizew=244)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/339b1cfb23924151797d0d76b584c9a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e536350bcd19804313eb04f43622943c.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7f66b146fccec50efa1c316aa1afe0.png)
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真题
【推荐3】如图,已知
是正三棱柱,D是AC中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/af03ebe7-b143-4176-8353-959e2d12ca02.png?resizew=168)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
平面
;
(2)假设
,求以
为棱,
与
为面的二面角
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a9ad711b25c36dae0c2a2cedff9954.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/af03ebe7-b143-4176-8353-959e2d12ca02.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4294ffdba16ae69fd03b13959d682aba.png)
(2)假设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa8345302e8036af33d4598282144d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4294ffdba16ae69fd03b13959d682aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c237015ab2c034ca97cbb3928f7f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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