如图,在棱长为2的正方体
中,
、
、
分别是
,
,
的中点,
是线段
上的动点,则下列命题:
①不存在点
,使
//平面
;
②三棱锥
的体积是定值;
③直线
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
④经过
、
、
、
四点的球的表面积为
.
正确的是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94ce22f30a8de2af135de3c89403aff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/e0c2cf53-8d74-41d8-a86e-021f04c24043.png?resizew=155)
①不存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babea91663e479b0018ebac5e36374d5.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbec5322800f0a88b7006bdb0a8de0fb.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565133e91e3ace2b2187cfc6f1db5be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
④经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e95a79288fcb7e47fba4410722e2bc6.png)
正确的是
2022·黑龙江佳木斯·三模 查看更多[4]
黑龙江省佳木斯市第一中学2022届高三第三次模拟数学(文)试题(已下线)第03讲 直线、平面平行垂直的判定与性质(练)四川省射洪中学校2023届高三上学期第三次月考文科数学试题四川省成都市天府新区实外高级中学2024届高三上学期10月月考数学(文)试题
更新时间:2023-07-23 20:40:41
|
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【推荐1】已知点
为半径等于2的球
球面上一点,过
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的截面圆为圆
,圆
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】已知
、
是球
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【推荐1】如图,已知二面角
的棱是
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,
,若
,
,
,且
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,则二面角
的大小为______ ,此时,四面体
的外接球的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ee0ddf2508e7f07ffbe5635033c931.png)
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【推荐2】已知三棱锥
外接球的直径
,且
,则三棱锥
的体积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e99aae9fa3f0cd6405461b8db163e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71de9ba8cb08067eaf7cda09db94e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
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【推荐1】棱长为
的正方体
中,
分别是线段
的中点,则直线
到平面
的距离为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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解题方法
【推荐2】如图,正方体ABCD –A1B1C1D1的棱长为1 ,线段AC1上有两个动点E、F,且 EF
,给出下列四个结论:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/abad8a04-c276-4525-b6ec-e681b1684a1f.png?resizew=186)
①CE⊥BD
②三棱锥E - BCF的体积为定值
③∆BEF在底面ABCD内的正投影是面积为定值的三角形
④在平面ABCD内存在无数条与平面DEA1平行的直线
其中,正确的结论是____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299f28bed01322a70d6404fd7b0f7b18.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/abad8a04-c276-4525-b6ec-e681b1684a1f.png?resizew=186)
①CE⊥BD
②三棱锥E - BCF的体积为定值
③∆BEF在底面ABCD内的正投影是面积为定值的三角形
④在平面ABCD内存在无数条与平面DEA1平行的直线
其中,正确的结论是
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【推荐1】已知四面体ABCD的所有棱长都相等,其外接球的体积等于
,则下列结论正确的是___________ .(填序号)
①四面体ABCD的棱长均为2;
②四面体ABCD的体积等于
,
③异面直线AC与BD所成角为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefdcd39676298f214654051fc51ba92.png)
①四面体ABCD的棱长均为2;
②四面体ABCD的体积等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c14ff9b66f21c05e52dc3c8908c2df.png)
③异面直线AC与BD所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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【推荐2】在三棱锥
中,
,
,
,则三棱锥
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