如图,在直四棱柱
中,
平面
,底面
是菱形,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/a396892f-c0a7-4fe4-ba70-40be0c70de4f.png?resizew=250)
(1)求证:
∥平面
;
(2)求证:平面
平面
;
(3)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.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/9a69138b166b2a53d994189c8eb29358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/a396892f-c0a7-4fe4-ba70-40be0c70de4f.png?resizew=250)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5cdffeb1fdad9935a00d40c9d650655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
更新时间:2022-07-07 15:28:35
|
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解答题-证明题
|
适中
(0.65)
【推荐1】四棱锥P﹣ABCD中,PA⊥平面ABCD,E为AD的中点,ABCE为菱形,∠BAD=120°,PA=AB,G,F分别是线段CE,PB上的动点,且满足
.
(1)求证:PG∥平面PDC;
(2)求λ的值,使得二面角F﹣CD﹣G的余弦值为
.
![](https://img.xkw.com/dksih/QBM/2011/12/12/1570570228695040/1570570234265600/STEM/763d8ab2fa9d49c697aa9536a63c1fe5.png?resizew=197)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0338a0094d579ab159da3cf838540d74.png)
(1)求证:PG∥平面PDC;
(2)求λ的值,使得二面角F﹣CD﹣G的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032fe40e17f7d64f5693dfde69da42eb.png)
![](https://img.xkw.com/dksih/QBM/2011/12/12/1570570228695040/1570570234265600/STEM/763d8ab2fa9d49c697aa9536a63c1fe5.png?resizew=197)
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【推荐2】如图,在四棱锥S-ABCD中,四边形ABCD菱形,
,平面
平面 ABCD,
.E,F 分别是线段 SC,AB 上的一点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/eb6c1f4a-d99a-4995-9479-8ae1c02519b2.png?resizew=190)
(1)求证:
平面SAD;
(2)求平面DEF与平面SBC所成锐二面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986a3c0345770b0220be8054caae5d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877582b5387278008d14fe5932622fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e887a890ba5619e188eae68d6be04ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d793e800c3f28145f30de96e8df394b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/eb6c1f4a-d99a-4995-9479-8ae1c02519b2.png?resizew=190)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16835e3f230ba3f543b6804e445e283.png)
(2)求平面DEF与平面SBC所成锐二面角的正弦值.
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解答题-证明题
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适中
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【推荐1】如图,四面体
中,
分别是
的中点,![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/940f3b1349f242c6b0920c61e21e6fc3.png?resizew=229)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/34c436ee940b42629800cdc93f932137.png?resizew=144)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/d401d3bc90a54f369af75f4cd53d2112.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/07eb632669dc4cde8faea1f75b4feb0e.png?resizew=43)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/5689b0eef29e4ca7862381e4965e2702.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/940f3b1349f242c6b0920c61e21e6fc3.png?resizew=229)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/34c436ee940b42629800cdc93f932137.png?resizew=144)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/97f07fe9481845a5b57023cb8d29c939.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/1dccb4a118b743d29748a02c0db59637.png?resizew=39)
(2)求直线
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/222cecc00c924b1e8bd03c0f4bf04e1b.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/019d101daf1a46ad844e2dc1ec267b08.png?resizew=39)
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【推荐2】如图,在三棱锥
中,
平面
,
,
.
(1)求证:
平面
;
(2)若
是
的中点,求
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e6b770b2be8beb1d3f4b3754708246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4e5548755c90782e8e8c2f7194220f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/e9dca9fc-a659-4fec-b89c-0f5c8dfcaa9e.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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(0.65)
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【推荐1】如图所示,等腰梯形
的底角
等于60°.直角梯形
所在的平面垂直于平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/2019/7/16/2248251863375872/2248572527706112/STEM/74559b369a914357852d102ea9177bf7.png?resizew=178)
(Ⅰ)证明:平面
⊥平面
;
(Ⅱ)点
在线段
上,试确定点
的位置,使平面
与平面
所成的角的余弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52fc2f9716b0bbd549a351f54fd674a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b0b84168e7a4ea2dd4915a5d60adf6.png)
![](https://img.xkw.com/dksih/QBM/2019/7/16/2248251863375872/2248572527706112/STEM/74559b369a914357852d102ea9177bf7.png?resizew=178)
(Ⅰ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
(Ⅱ)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2977ae4bfa32de8c6f0fb136205c4fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
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【推荐2】如图,在四棱锥P﹣ABCD中,底面ABCD为平行四边形,且∠BAP=∠CDP=90°
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/91b8c5d3-d677-40b2-b343-fd9cdcca7221.png?resizew=172)
(1)证明:平面PAB⊥平面PAD;
(2)若PA=PD=AB=
AD,且四棱锥的侧面积为6+2
,求四棱锥P﹣ABCD的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/91b8c5d3-d677-40b2-b343-fd9cdcca7221.png?resizew=172)
(1)证明:平面PAB⊥平面PAD;
(2)若PA=PD=AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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