如图,四棱锥
的底面BCDE是平行四边形,
,
,
,点F,G分别为棱BE和CD的中点,
.
![](https://img.xkw.com/dksih/QBM/2022/9/2/3058024714117120/3064171451334656/STEM/d0489a0d6f9a4efc950650f9f2f652c6.png?resizew=306)
(1)证明:平面
平面BCDE;
(2)若
,求过点G且平行于平面ABC的平面截四棱锥
所得截面多边形的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a531df73228cfda5c1382f45fb8c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/713d4e968d4852e0258aa1307f5d47f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a277db452e76240ec83ec6a2864bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876bb8ce0ca53475fa091ffd18bdc94a.png)
![](https://img.xkw.com/dksih/QBM/2022/9/2/3058024714117120/3064171451334656/STEM/d0489a0d6f9a4efc950650f9f2f652c6.png?resizew=306)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
22-23高三上·江西·开学考试 查看更多[2]
更新时间:2022-09-11 14:55:41
|
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(1)求
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【推荐2】在平面四边形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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名校
解题方法
【推荐1】如图,三棱锥
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/18786fc0-1e66-480d-a19f-9a9d914146b6.png?resizew=170)
(1)若平面
平面
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/18786fc0-1e66-480d-a19f-9a9d914146b6.png?resizew=170)
(1)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd82d880985b1490bc5f4bb7fdee1cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baceb049bf16ed0fd33639fdda0ec5ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3237c82088b1ac0c5ba31b7714d5164b.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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解题方法
【推荐2】如图,在正方体ABCD-A1B1C1D1中,E,F分别是棱AB,BC的中点,O是底面ABCD的中心,求证:EF⊥平面BB1O.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/a302a0bf-f425-472c-9151-0a02b238f303.png?resizew=172)
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【推荐1】如图所示,在长方体
中,
,
,
是棱
的中点.
(Ⅰ)求异面直线
和
所成的角的正切值;
(Ⅱ)证明:平面
⊥平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/46df0d50-54ec-4bce-bdc4-27043f024941.png?resizew=157)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
(Ⅰ)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9399c9a2a31b0e3165aea2d6ccc4f7c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
(Ⅱ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3653ada76ba0c8afe9d57c8e7832c6ed.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/46df0d50-54ec-4bce-bdc4-27043f024941.png?resizew=157)
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【推荐2】如图所示,在三棱柱
中,侧面
为菱形,
,
,侧面
为正方形,平面
平面
.点
为线段
的中点,点
在线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461211869208576/2461809766744064/STEM/a1110cff-249c-4897-a013-7f3dfdc90387.png)
(1)证明:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2819c0e194dea440eace967c1f461b.png)
![](https://img.xkw.com/dksih/QBM/2020/5/12/2461211869208576/2461809766744064/STEM/a1110cff-249c-4897-a013-7f3dfdc90387.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d9bdbbdfabc737323692c796e41930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e06947327f4c41340b8713e8a6b4c87.png)
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