如图所示的三棱锥
,
平面
,
,若
,
,
,
,当
取最大值时,点
到平面
的距离为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/9188119f-5fad-47e6-b6e2-e128bdf66e15.png?resizew=125)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c4340dcffb0783d118a587e5352a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00803e67a5d417a9a4dc00277fca778b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54bf739ada87edb51304d38f09b46d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba03505a2ec6653c4a65830d61694c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f384e98d574fa2676d61624285f88188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/9188119f-5fad-47e6-b6e2-e128bdf66e15.png?resizew=125)
A.![]() | B.![]() | C.![]() | D.5 |
2021·山西吕梁·三模 查看更多[6]
山西省吕梁市2021届高三三模数学(文)试题陕西省2021届高三下学期教学质量检测测评(五)文科数学试题(已下线)“超级全能生”2021届高三全国卷地区5月联考试题(乙卷)数学(文)试题(已下线)“超级全能生”2021届高三全国卷地区5月联考试题(甲卷)数学(文)试题(已下线)考点17 基本不等式-备战2022年高考数学(文)一轮复习考点微专题(已下线)专题18 立体几何空间距离与截面100题-【千题百练】2022年新高考数学高频考点+题型专项千题百练(新高考适用)
更新时间:2021-05-16 15:27:32
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【推荐1】下列说法正确的是( )
A.若x,![]() ![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.函数![]() ![]() |
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【推荐2】下列结论正确的个数是
①若正实数
满足
,则
的最小值是16;
②已知
,则函数
的最大值为
;
③已知
,且
,则
的最小值是36;
④若对任意实数
,不等式
恒成立,则实数
的取值范围是
.
①若正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ecae5f8753141cf8d274afb20a1907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3697ec54c1e6516bb71f5b2431d1870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcb6ea431bc38718c156d3866f83bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
③已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa8e3deed4ff7dd63a17330d92317044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd24c686fbaaa68705d654b880481ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f944800d4f74974430baf6fbdca012b.png)
④若对任意实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3fa2be71181e0e9b4850ef53846af3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】设
是同一个球面上四点,球的表面积为
,
是边长为6的等边三角形,则三棱锥
体积的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc2a78406f5e1e9936c60851f6e9500.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知底面是等腰直角三角形的三棱锥P-ABC的三视图如图所示,俯视图中的两个小三角形全等,则( )
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386303886098432/2387066580353024/STEM/f202e46cbc3e4d4799897dd1ebcfa5ee.png?resizew=234)
![](https://img.xkw.com/dksih/QBM/2020/1/27/2386303886098432/2387066580353024/STEM/f202e46cbc3e4d4799897dd1ebcfa5ee.png?resizew=234)
A.PA,PB,PC两两垂直 | B.三棱锥P-ABC的体积为![]() |
C.![]() | D.三棱锥P-ABC的侧面积为![]() |
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【推荐1】如图,在长方体
中,
,
,点
在侧面
上,满足到直线
和
的距离相等的点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/f21d17ab-db80-419c-a8ab-55ee66be1ac7.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/f21d17ab-db80-419c-a8ab-55ee66be1ac7.png?resizew=148)
A.不存在 | B.恰有1个 | C.恰有2个 | D.有无数个 |
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【推荐2】在长方体
,底面是边长为
的正方形,高为
,则点
到截面
的距离为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知正方形
的边长为4,对角线
与
交于点
,将正方形
沿对角线
折成60°的二面角,
到
点.给出下列判断:①
;②
;③
为正三角形;④
;⑤
到平面
的距离为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bbe037f309a1091879696a06f4f81bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1201909ccdb752af580c145d42230a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356e5cd163a4b2049c7c11bdef6049dd.png)
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A.2 | B.3 | C.4 | D.5 |
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【推荐2】如图,在矩形
中,
,
,
和
交于点
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沿直线
翻折,则错误的是( )
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A.存在![]() ![]() |
B.存在![]() ![]() |
C.存在![]() ![]() ![]() |
D.存在![]() ![]() ![]() |
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