如图,在直角梯形ABCP中,AP
BC,AP
AB,
,D是AP的中点,E、F分别为PC、PD的中点,将△PCD沿CD折起得到四棱锥
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/476f5719-8177-4f4f-85cd-07f5adb2139b.png?resizew=298)
(1)G为线段BC上任一点,求证:平面EFG
平面PAD;
(2)当G为BC的中点时,求证:AP
平面EFG.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf60f382809c325644b9f4217de33ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a4b8b69b419c557ba61a2bdfaf4066.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/476f5719-8177-4f4f-85cd-07f5adb2139b.png?resizew=298)
(1)G为线段BC上任一点,求证:平面EFG
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
(2)当G为BC的中点时,求证:AP
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
2023高三·全国·专题练习 查看更多[3]
更新时间:2022-09-19 22:57:13
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【推荐1】如图,在多面体ABCDEF中,ABCD是正方形,BF⊥平面ABCD,DE⊥平面ABCD,BF=DE,点M为棱AE的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/d4f04f1a-0fb6-4489-b156-9b42f20f400f.png?resizew=147)
(1)求证:平面BMD∥平面EFC;
(2)若AB=1,BF=2,求三棱锥A-CEF的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/d4f04f1a-0fb6-4489-b156-9b42f20f400f.png?resizew=147)
(1)求证:平面BMD∥平面EFC;
(2)若AB=1,BF=2,求三棱锥A-CEF的体积.
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解答题-证明题
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【推荐2】在正四棱柱
中,
,
,M为BB1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/d1ac38fe-adac-4a8e-9169-3f7ed015255a.png?resizew=125)
(1)求证:平面
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/d1ac38fe-adac-4a8e-9169-3f7ed015255a.png?resizew=125)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f079d923874b2357072efbba65463a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2f7554a52815bfa0f4d75221ba7397.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb92a5e7dc942c44d0f6d7f3906ff804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b9327d9951a5307f86a876b0575607.png)
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解答题-证明题
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【推荐1】如图所示正四棱锥S﹣ABCD,SA=SB=SC=SD=2,AB
,P为侧棱SD上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/cb7f1034-5858-43cf-a849-7a9fd4aa35c2.png?resizew=177)
(1)求证:AC⊥SD;
(2)若
,
(ⅰ)求三棱锥S﹣APC的体积.
(ⅱ)侧棱SC上是否存在一点E,使得BE∥平面PAC.若存在,求
的值;若不存在,试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae65bdb69940a67a18d56ff02060b22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/cb7f1034-5858-43cf-a849-7a9fd4aa35c2.png?resizew=177)
(1)求证:AC⊥SD;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccc5b6171589920f276183723e584c6.png)
(ⅰ)求三棱锥S﹣APC的体积.
(ⅱ)侧棱SC上是否存在一点E,使得BE∥平面PAC.若存在,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea0808c7df5a3fa6678ee5406b35b25.png)
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【推荐2】如图,在五面体
中,四边形
是正方形,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709417112903680/2709439195144192/STEM/6d92c473d9894116a996b0b1ebea1bac.png?resizew=167)
(1)求证:平面
平面
;
(2)设
是
的中点,棱
上是否存在点
,使得
平面
?若存在,求线段
的长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b31e19fa5cf6d4d5f14f90e87d34ee.png)
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709417112903680/2709439195144192/STEM/6d92c473d9894116a996b0b1ebea1bac.png?resizew=167)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85f14d046c7d50a349b9c1fcf717d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
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【推荐1】如图,四边形
是边长为2的正方形,
为等腰三角形,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f45209f9-58e5-47ea-af71-535ab2d91bf6.png?resizew=105)
(1)求证:平面
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fccf1cd8600af23d55876ab14e66e2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/f45209f9-58e5-47ea-af71-535ab2d91bf6.png?resizew=105)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade68d3f913ba0357f38a808392f5820.png)
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【推荐2】如图,四边形ABCD为菱形,G为AC与BD的交点,
平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/29f105d8-ae91-45ef-a929-b1d3dcc2cb89.png?resizew=185)
(1)证明:平面
平面BED;
(2)若
,
,
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/29f105d8-ae91-45ef-a929-b1d3dcc2cb89.png?resizew=185)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a46fbde58e12b1edc038ae9e921722.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeeee5f39ee6f9c3ea01ada75d63b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1096513fddd57d162d6683d6e4f2dc9b.png)
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