解题方法
1 . 棱长为2的正方体
中,设点
为底面
内(含边界)的动点,则点
到平面
距离之和的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04d6165b18f1a031b2a137961832491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 已知向量
,
,
,则
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c958b65bafe9caae7ec41be3a7085527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd9218a657b17654c5d757a6f7dee9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f27481c3e3f0a647379ecd926e616ec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93af88a7628c71d642d3a6df067c15f5.png)
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3卷引用:陕西省西安市第一中学2023-2024学年高三下学期高考考前模拟考试理科数学试题
3 . 已知□ABCD中,点P在对角线AC上(不包括端点A,C),点Q在对角线BD上(不包括端点B,D),若
,
,记
的最小值为m,
的最小值为n,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43bb3fb750948cd5eb2ee343d96c285c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a08557b7019b87fb3b4848527f59d5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988bc9959a454f14decc997053ada91a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/330914a84b8cc7d9fe5cba58ec1b7218.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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4 . 已知
,
,
,则下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/254aebe3ef7eabdf41e46c1cd857c705.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() ![]() |
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5 . 已知
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae5a9f33df69fd5f97f9c2dce934ec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9659af61c4dd462d7962be86d0e329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 记
,若存在
,满足:对任意
,均有
,则称
为函数
在
上的最佳逼近直线.已知函数
,
.
(1)请写出
在
上的最佳逼近直线,并说明理由;
(2)求函数
在
上的最佳逼近直线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30cb4bea650ae8618d9797fafcb15758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84abd34be284858c51851dea74564d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e37c312660ff0444b24a0f4cec11345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b127ed49c184b58e086a9ada111bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d48723f19dadc0eb7bc5300f75dd7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8d68e46cb76a04d2a2ebd7c0981138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5ff6072bb799712801e9375d433783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01745f0dff16a69a195e0d0c2c798258.png)
(1)请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01745f0dff16a69a195e0d0c2c798258.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93e97956c25f52a919e9324da39f60bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01745f0dff16a69a195e0d0c2c798258.png)
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7 . 如图,平面四边形
由等腰
与等边
拼接而成,其中
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
的值;
(2)若
,当
取得最小值时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73be34bd75ef7556bd72643d4a9a68f2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfbedbad650c4723ff6d95fef4fc47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992907998c85cf872f6e66df0b0c1030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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8 . 已知集合
,
则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aab0ce652fa3cc30e7f65dbead5e9a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df2e5560fce844811ef4c0a16d74a00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e60375f97ff7854f4d3a8b1108d2e3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 已知全集
,集合
,则
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860ebb6f76cd3cb9a265dfc233002a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a87282747f3ccefec81cb5369189f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368dd70c0435a6a2cc5ec710e31274aa.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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10 . 已知a为实数,函数
,
.
(1)设
,
,若函数
的最大值等于2,求a的值;
(2)若对任意
,都存在
,使得
,求a的取值范围;
(3)设
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1c079afd1b058adc67a50f48f3d466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6076f2c305797168a666280436eb6e8f.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605705b3da667e82dd7787b4741b261e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77156221148913fb706a2d57d9b9100c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/327e81d90543aa594968112a73bfa2ad.png)
(2)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b3a5b4f2b7279a7aa94f8ec12b3f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3b1d05315ce6c73c0ad0500845a409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29cf4f9640637c4ec7804da532b6a819.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b200636f87441fc3e8788675391f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
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