1 . 如图,在四棱锥P-ABCD中,底面ABCD是菱形,
,AB=2,PA=1,
平面ABCD,E是PC的中点,F是AB的中点.
![](https://img.xkw.com/dksih/QBM/2011/5/26/1570223301763072/1570223306948608/STEM/4e186ddea75c4e3a8224a0b7a3b7353a.png?resizew=278)
(1)求证:BE∥平面PDF;
(2)求证:平面PDF⊥平面PAB;
(3)求三棱锥P-DEF的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71a46dc0bb5d8fa33583817e530a5d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://img.xkw.com/dksih/QBM/2011/5/26/1570223301763072/1570223306948608/STEM/4e186ddea75c4e3a8224a0b7a3b7353a.png?resizew=278)
(1)求证:BE∥平面PDF;
(2)求证:平面PDF⊥平面PAB;
(3)求三棱锥P-DEF的体积.
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2 . 如图,在四棱锥P-ABCD中,PD⊥平面ABCD,四边形ABCD是菱形,AC=6,BD=8,E是PB上任意一点.
(1)求证:AC⊥DE;
(2)若PB与平面ABCD所成角为
,E是PB上的中点,求三棱锥P-AED的体积.
(1)求证:AC⊥DE;
(2)若PB与平面ABCD所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://img.xkw.com/dksih/QBM/2011/5/26/1570223038988288/1570223044083712/STEM/cba5f3ce7e324d89b7f0808be5cfe352.png?resizew=172)
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3 . 如图a,在直角梯形ABCD中,AB⊥AD,AD∥BC,F为AD的中点,E在BC上,且EF∥AB.已知AB=AD=CE=2,沿线段EF把四边形CDFE折起如图b,使平面CDFE⊥平面ABEF.
(1)求证:AB⊥平面BCE;
(2)求三棱锥
体积.
(1)求证:AB⊥平面BCE;
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32fdd65aa55d1833750ef453a295d19.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/13712104-aa7a-4a66-9e51-d38d1f55eb5a.png?resizew=258)
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2011·江苏南京·二模
解题方法
4 . 如图:四棱锥
的底面为矩形,且
,
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2011/3/31/1570095178530816/1570095183396864/STEM/faabf7c3e9844b2d8b2876064fda967e.png?resizew=265)
(1)求证:
平面
;
(2)若点
在平面
内的正投影
在直线
上,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f70d6f5baadf8139ee650b84f2fde70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cca777c664ecc22e40dff4ccae6b248.png)
![](https://img.xkw.com/dksih/QBM/2011/3/31/1570095178530816/1570095183396864/STEM/faabf7c3e9844b2d8b2876064fda967e.png?resizew=265)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
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5 . 如图,四棱锥C的底面是正方形,PA⊥平面ABCD,PA=2,∠PDA=45°,点E、F分别为棱AB、PD的中点.
![](https://img.xkw.com/dksih/QBM/2019/1/13/2118007947599872/2118557981270016/STEM/11305cd7f8904e399d5480b09f1740e6.png?resizew=192)
(1)求证:AF∥平面PEC
(2)求证:平面PCD⊥平面PEC;
(3)求三棱锥C-BEP的体积.
![](https://img.xkw.com/dksih/QBM/2019/1/13/2118007947599872/2118557981270016/STEM/11305cd7f8904e399d5480b09f1740e6.png?resizew=192)
(1)求证:AF∥平面PEC
(2)求证:平面PCD⊥平面PEC;
(3)求三棱锥C-BEP的体积.
您最近一年使用:0次
2016-12-04更新
|
1187次组卷
|
4卷引用:2010年江苏省高三考前热身数学试题(2)
2010·江苏盐城·一模
解题方法
6 . 如图,在四棱锥
中,底面
是正方形,侧面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
底面
,且
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/2016/1/18/1572441545752576/1572441551028224/STEM/e586a2e27cd64fd7ab47ac4d02b05098.png?resizew=217)
(1)求证:直线
平面
;
(2)求证:直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
.
![](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/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2016/1/18/1572441545752576/1572441551028224/STEM/e586a2e27cd64fd7ab47ac4d02b05098.png?resizew=217)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
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7 . 如图,四棱锥P-ABCD中,PA^平面ABCD,AD∥BC,AB^AD,BC=,AB=1,BD=PA=2.
![](https://img.xkw.com/dksih/QBM/2015/6/25/1572146694864896/1572146700869632/STEM/94198c82c07d40c5bee94db17d143b37.png)
(1)求异面直线BD与PC所成角的余弦值;
(2)求二面角A-PD-C的余弦值.
![](https://img.xkw.com/dksih/QBM/2015/6/25/1572146694864896/1572146700869632/STEM/94198c82c07d40c5bee94db17d143b37.png)
(1)求异面直线BD与PC所成角的余弦值;
(2)求二面角A-PD-C的余弦值.
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