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解题方法
1 . 如图,已知平面
平面
,四边形
是正方形,四边形
是菱形,且
,点
分别为边
的中点,点
是线段
上的动点.
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638704566247424/1656268033253376/STEM/cef19feb86ea43e99d354edbbc3b725c.png?resizew=236)
(1)求证:
平面
;
(2)求三棱锥
的体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674dc5024374f53920947c4cf4baf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f611d0a0894890a13e08135c1b887d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bc67cc4eb17a62a39d9105ca763a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638704566247424/1656268033253376/STEM/cef19feb86ea43e99d354edbbc3b725c.png?resizew=236)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d07d16fc91aa960b67ba4b474de8a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350b7afa86146fb39d1fcd456c862b49.png)
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2017-04-01更新
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878次组卷
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3卷引用:2017届广西陆川县中学高三下学期知识竞赛文数试卷
2 . 某几何体的三视图如图所示,那么该几何体的体积是
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638704566247424/1656268032958464/STEM/b1fef09888424be593aae49fdb04699d.png?resizew=173)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638704566247424/1656268032958464/STEM/b1fef09888424be593aae49fdb04699d.png?resizew=173)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知圆
:
与圆
:
相交于
、
两点,则线段
的垂直平分线的方程为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585033e0bb1bbad7c012172c1d5f7265.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ed86318870db1b0d583f0744fb1ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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4 . 如图为一个多面体的三视图,则该多面体的体积为
![](https://img.xkw.com/dksih/QBM/2017/5/10/1683941228077056/1683988839473152/STEM/7b363777d21344dbb2e5f4ee2f54c4a6.png?resizew=167)
![](https://img.xkw.com/dksih/QBM/2017/5/10/1683941228077056/1683988839473152/STEM/7b363777d21344dbb2e5f4ee2f54c4a6.png?resizew=167)
A.![]() | B.7 | C.![]() | D.![]() |
您最近一年使用:0次
2017-04-01更新
|
1039次组卷
|
6卷引用:2017届广西陆川县中学高三下学期知识竞赛理数试卷
2017届广西陆川县中学高三下学期知识竞赛理数试卷山东省淄博市2017届高三第二次模拟考试数学(理)试题江西省南昌市南昌县莲塘一中2018届直升班周末练试卷数学试题【全国百强校】黑龙江省哈尔滨市第六中学2018届高三下学期考前押题卷(一)数学(理)试题【市级联考】广东省广州市2019届高三年级第一学期调研考试(零模)理科数学试题(已下线)专题35 高频考点之三视图问题-备战2022年高考数学一轮复习一网打尽之重点难点突破
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5 . 已知
与平面
,且
,
于
,若边
平面
,边
、
与平面
所成的角分别为
和
,则
与平面
所成角的大小为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be509ef5101aae24609ff9941cb246fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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