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1 . 在处理多元不等式的最值时,我们常用构造切线的方法来求解.例如:曲线
在
处的切线方程为
,且
,若已知
,则
,当
时等号成立,所以
的最小值为3.已知函数
,若数列
满足
,且
,则数列
的前10项和的最大值为________ ;若数列
满足
,且
,则数列
的前100项和的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c72a671c1fba30deaf0f1bbbd4f34df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7152aea5d046953a8c931571be7c529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb815fd4ab37e3acce07473dddc6d5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f285defc2f91858fae9472d090ef34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4dd6e208196f02dba2106dbcfb68569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8285778d6832045498a16d1ceb1da957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91540ab4e6e0ac4b7be750ad9f9c5f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a871d59989f13df946a72de050e7ec53.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065054f4e163585d630aa42cb6323a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36562bec957b5ab3ca3b64bc3dc1c1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282328f6df9c9c524084dc76f8499a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a083c38783fda991b05eaf051ee6c1df.png)
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2 . 已知
则
的最大值为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb6ffcd02cf6c34c7e3329f276b7059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f413843d2f1bf5b2d08c385faa7061.png)
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3 . 不等式
的解集是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd3bbb34b937249c4e0d3511e74c63b.png)
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4 . 已知一圆柱内接于一个半径为
的球内,则该圆柱的最大体积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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解题方法
5 . 不等式
的解集为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dae98d5c942f14dd94df368a95ce46c.png)
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6 . 已知
,若
恒成立,则实数
的取值范围是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e46371f310e03a153a1698aad9d4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2926ca4054ea14ae7e4f7d64b59bd8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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7 . 在△ABC中,角A,B,C所对的边分别为a,b,c,若
,则对任意的
都必须满足___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88efa39a2b050d651c325a410bc9fd70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1784097920fd4be66b6b42544dd73dce.png)
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8 . 不等式
的解集为_____________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82fb87aab767b51039a9827289e2f92.png)
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2010·广东·三模
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9 . 若对任意
,
有唯一确定的
与之对应,则称
为关于
,
的二元函数,现定义满足下列性质的
为关于实数
,
的广义“距离”.
(
)非负性:
,当且仅当
时取等号;
(
)对称性:
;
(
)三角形不等式:
对任意的实数
均成立.
给出三个二元函数:①
;②
;③
,
则所有能够成为关于
,
的广义“距离”的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc4d5f4cc4f20f44adbae0d2373681b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c3c1ed4fb65ab9505ad8078d8d0fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c3c1ed4fb65ab9505ad8078d8d0fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c3c1ed4fb65ab9505ad8078d8d0fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638df541efb3448608fbad59195e7c99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0d10d93a4cd75d6987cffce7ce7a84.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb1647c7592d692093ccb10ba99ff0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
给出三个二元函数:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f322b17f7284251845f84b376f2ec134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6820cb93dea9eb8430dc184664acb4b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c112be1d02723667d2932f0b18eab7ed.png)
则所有能够成为关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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(已下线)广东省华南师大附中2010届高三第三次模拟考试数学试卷(理科)北京市西城区44中2018届高三上12月月考数学试题北京市西城44中2017届高三12月月考数学(理)试题2019年上海市上海中学高三下学期数学测试2数学试题
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10 . 若关于
的不等式
(的解集为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b9afe6e2307c6a8b0097a6c45b227c.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029b04d79ffd253c18154a169665f914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4ddbc37ced9de518eb7b0801b96d5e.png)
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