2023高三·全国·专题练习
名校
解题方法
1 . 已知阻值分别为
,
(
,
均不为0)的两种电阻,连接成两个不同的电路图,分别如图1、图2所示,它们的总阻值分别记为
,
.则
,
的大小关系为______ ;若
,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3809dcdc5e9eb9e901c827698e04e21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11be83809dffb480b3a9769219710762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3809dcdc5e9eb9e901c827698e04e21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11be83809dffb480b3a9769219710762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b4389f4d8a4520456ad964c1e270eb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11be83809dffb480b3a9769219710762.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/0f26ca62-78ea-4038-854b-71a8e2b98a8b.png?resizew=306)
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2 . 已知实数a,b,则下面说法正确的是( )
A.若![]() ![]() |
B.若a,b均大于0且![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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2023-05-26更新
|
796次组卷
|
2卷引用:湖北省武汉市华中师范大学第一附属中学2023届高三下学期5月压轴卷数学试题(一)
3 . 在
中,
,
,若
为其重心,试用
,
表示
为________ ;若
为其外心,满足
,且
,则
的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79f2cfa5e197f859d8cac3d2287ece9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39282450bc4833027a7bdfa81c39f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc82b2473d4295b1f6351c46b7f1fd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a6510ac6350e9df2a3540fd459e31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1e9198ee4a149e2d3858b2c92990ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
4 . 三条侧棱两两垂直的三棱锥往往称为直三棱锥,在直三棱锥
中,
两两垂直.
(1)设直三棱锥
外接球的半径为
,证明:
;
(2)若直三棱锥
外接球的表面积为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4697e1b0bc8288d139a7a431f17598b.png)
(1)设直三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e675285234caa93c31b2a8068635a.png)
(2)若直三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178ec48ec6dec55778c74962a928d600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a0b194b9002709884ce1fdbd207879.png)
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2023高三·全国·专题练习
解题方法
5 . 已知圆锥SO的轴截面
是边长为2的等边三角形,M为母线SA的中点,N为AB上靠近点B的三等分点,C位于底面圆周上,且
.若过劣弧
上的动点P作AB的平行线交OC于点Q,则三棱锥M-PQN体积的最大值为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e49817548cb45b3d1e58570644c6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/183ec02812ee8cda06c714eb3cee0ad1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
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解题方法
6 . 已知正方体
的外接球表面积为
,
分别在线段
,
,
上,且
四点共面,则( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02dba908a505cff93e0b297d00b82a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9369aed2d8309af46ac3eaffb9cce537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3cb9ece7e512264306bd7a585b69f07.png)
A.![]() |
B.若四边形![]() ![]() |
C.四边形![]() ![]() ![]() |
D.四边形![]() ![]() ![]() |
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2023-03-28更新
|
632次组卷
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2卷引用:山东省齐鲁名校2022-2023学年高三下学期3月大联考数学试题
2023·全国·模拟预测
解题方法
7 . 已知长方形纸片
中,
,点
分别是边
上的动点,且
,将长方形纸片
沿
进行翻折,使得
,连接
,得到一个三棱柱
,如图.已知三棱柱
的体积是10,当三棱柱
的外接球的表面积取得最小值时,
的面积是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6eb637795c7fef598919a6ef733a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73caf2603a24e46eae3a4e552bc70294.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc375393482e61a0bf94e758046996f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc375393482e61a0bf94e758046996f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc375393482e61a0bf94e758046996f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d4cacd518769ce19310f5d9c6e73b86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/64dc0130-24bd-494d-8a97-2469abafa658.png?resizew=170)
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解题方法
8 . 如图,P为半圆(AB为直径)上一动点,
,
,记
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/13f41dd8-dfc7-4bd2-92b8-a91fea57ec06.png?resizew=138)
(1)当
时,求OP的长;
(2)当
面积最大时,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50bf7d7fa347c09dedde116bb787a3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db5e90d59e2f4f4663c2ed16d3a184f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/13f41dd8-dfc7-4bd2-92b8-a91fea57ec06.png?resizew=138)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2212c19e55001b3cd6c7c656edeae538.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d0151288363337e743d5796b952473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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2023-02-23更新
|
1098次组卷
|
6卷引用:河南省叶县高级中学等2校2022-2023学年高三下学期2月模拟考试(一)数学(理科)试题
解题方法
9 . 若直线
与椭圆
交于
两点,
分别是椭圆的左、右焦点,
是动点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b343d77ee4dced82ecc479206c42977d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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10 . 已知
,
,给出下列结论:
①若
,
,则B的值唯一;
②若
,则
有最大值;
③若
,则
的最小值为
.
其中,所有正确的结论序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f9c88edac18a30697feb5a9956b70b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e1bd4f72b3edd9647378d1191857fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e71c76949f930de79abdbddacf243b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d63d1200ef5de2c40f2022af10a87b74.png)
其中,所有正确的结论序号为
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