在几何体
中,如图,四边形
为平行四边形,
,平面
平面
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/6/12/2482829342801920/2483328407314432/STEM/2f52fb44d7a54c77b28a313c76f36a0e.png?resizew=148)
(1)求证:
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/806625a93511075586360d7f9f335f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b860dfa4b838fb65b54eb4be48c2994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de22059d7d80f24817235269e9bb1ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e0bd4b30dc777ac9da80f6baa3eb31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf6d336ec41c4da56ccd4ac9e0f977b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e458dd1ce1c8dcdc2becac146d9dc231.png)
![](https://img.xkw.com/dksih/QBM/2020/6/12/2482829342801920/2483328407314432/STEM/2f52fb44d7a54c77b28a313c76f36a0e.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a17158a669a634e3db538ce76471950.png)
2020·四川绵阳·模拟预测 查看更多[5]
四川省绵阳市2020届高三年级高考适应性考试(四诊)理科数学试题山东省泰安肥城市2020届高三适应性训练(二)数学试题(已下线)专题19 立体几何综合-2020年高考数学(理)母题题源解密(全国Ⅲ专版)四川省泸州市泸县第四中学2022届高三三诊模拟考试理科数学试题四川省泸州市泸县第四中学2022届高三下学期高考适应性考试数学(理)试题
更新时间:2020-06-12 23:27:29
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【推荐1】如图,
,直线a与b分别交
于点A,B,C和点D,E,F,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c153f8691d9143848315ca25f753a415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba63ad02b1d5af2982fac3d91eb15c.png)
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【推荐2】如图所示,正方体
的棱长为3,
是棱
上的一个动点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714413251231744/2784548576878592/STEM/7a780e9ec6584ae9a2c4d8c0a411e741.png?resizew=252)
(1)求证:平面
平面
;
(2)若
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554b3b4c5ce7aca81becc07ed4903736.png)
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714413251231744/2784548576878592/STEM/7a780e9ec6584ae9a2c4d8c0a411e741.png?resizew=252)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ce82a4c37365f2d4dea2c4ad2e3288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70abed7faf55deb24162255c5ad59577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7175df06e33cad4e6bbc3f2f6b0a2986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4734735213b599a9915e1ed91a5d8ce4.png)
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【推荐1】如图,在三棱柱
中,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/30/2969359389483008/2970868129538048/STEM/a6c536bd-2753-4cbf-b722-c6eced505bf0.png?resizew=221)
(1)求证:
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(2)记
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上,满足
平面
,求直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25e8fc3dda4f8b45491514b6e22a962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef694d47866cea579d0c590bd8712cf9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/30/2969359389483008/2970868129538048/STEM/a6c536bd-2753-4cbf-b722-c6eced505bf0.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231673dd67ab79d3c5da73904ceade1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
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【推荐2】如图,四棱锥P-ABCD中,底面ABCD是梯形,AB∥DC,∠ABC=90°,AB=1,
,DC=2,E是棱DC的中点;侧面PAD是正三角形,侧面PAD⊥底面ABCD.
(1)求证:PE⊥BD;
(2)求点A到平面PBD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd406d8dc0e7c84a95da36f95b859257.png)
(1)求证:PE⊥BD;
(2)求点A到平面PBD的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/b712e910-380d-4e79-b16e-cd743168abe7.png?resizew=173)
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【推荐3】如图,已知正方形ABCD和矩形ACEF所在的平面互相垂直,
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d513db97-63a3-41c9-a9fd-8c3a74c7399c.png?resizew=172)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
平面BDE;
(2)求证:
平面BDF;
(3)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32456ccb324ca898b27d3e024fe7de9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/d513db97-63a3-41c9-a9fd-8c3a74c7399c.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4019805fed3b6cca619f4035e7618cd0.png)
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【推荐1】如图,菱形ABCD中,
,
,E为BC上一点,满足
,将棱形沿BD对折,形成四面体C-ABD,满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/196d092d-b285-4dcb-a84d-6da84751bc92.png?resizew=303)
(1)求三棱锥E-ABD的体积;
(2)求二面角A-DE-B的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13c772461aef1d9d715129636739748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/196d092d-b285-4dcb-a84d-6da84751bc92.png?resizew=303)
(1)求三棱锥E-ABD的体积;
(2)求二面角A-DE-B的正弦值.
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【推荐2】在正六棱柱
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/6caef409-30d6-4395-8415-14cd424c23ea.png?resizew=138)
(1)求
到平面
的距离;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858be9a2f30a22cfdebeaa5bf2e45b4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f21c7c194c5bc2986a21fd441c81495.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/6caef409-30d6-4395-8415-14cd424c23ea.png?resizew=138)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019efc97696ff32a8c1bcb82c48d2485.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ab7103d6b07b5818bf6a0fae0c9ab6.png)
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