2023高三·全国·专题练习
1 . 设
是正实数.证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1847981353664884fb0baca459e43827.png)
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2023高三·全国·专题练习
2 . 已知
是正实数,且满足
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56667aabbe787eb1c3189d487d203e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec8f5a45d9b7e4414fcbb11499d2a8d.png)
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2023高三·全国·专题练习
3 . 已知
是非负实数,且满足
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd24c686fbaaa68705d654b880481ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f4f5b5fb41a9726d926ab859b6df6a.png)
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4 . 设P是
内一点,求证
,
,
中至少有一个小于或等于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bafaec1cbb31d644a0df6bbd4fe4f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404fc19da3e4da41e9147e9f0ca64957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715c21f2228f0ac61aa5b7a52329eaf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
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2023高三·全国·专题练习
5 . 已知P为
内部或边上一点,P到三边的距离分别为PD,PE,PF,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e48f5557c4d3ea616caee0f0324f48b.png)
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2023高三·全国·专题练习
6 . 设n边形的边长分别为
且
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9080a7449480ea117e133abce07db351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/791b02aea3d9a87f1ea938809b0b4bdd.png)
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7 . 已知
是锐角三角形,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f14fb32d2992e8c7d25e643ae33fb5e.png)
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2023高三·全国·专题练习
8 . 在凸四边形ABCD中有
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507c6d64439109c1c28ffd04c7a3e635.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43e972e9aaebcbacc27f6e92e185bb12.png)
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2023高三·全国·专题练习
9 . 设
是实数,则在
中,有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ac49ab7c8001c209b8611b9ea40d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf29e3dd3ea464b314f04bab087e5b7.png)
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