1 . 到
分别为
,求
的最小值.
您最近一年使用:0次
解题方法
2 . 已知集合
,
,其中
,且
.若
,且对集合A中的任意两个元素
,都有
,则称集合A具有性质P.
(1)判断集合
是否具有性质P;并另外写出一个具有性质P且含5个元素的集合A;
(2)若集合
具有性质P.
①求证:
的最大值不小于
;
②求n的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9a3f4c7334a730ea37d803402891d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8b572950af972d5e265f689e35314c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1368a045ba80f97383f3d9d7fcdc8f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a0838190df3e2d7328dae29243d10a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85463b225751e4fb81ae802db61176bb.png)
(1)判断集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6632f39a4c514336a74d274bb3d6a77d.png)
(2)若集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8b572950af972d5e265f689e35314c.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2b789cb4ce6b7919d64d88dbdc1c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7426bc7343f7c515f079530f93e0c3a.png)
②求n的最大值.
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3 . 调查某地居民每年到商场购物次数
与商场面积
、到商场距离
的关系,得到关系式
(
为常数).如图,某投资者计划在与商场
相距10km的新区新建商场
,且商场
的面积与商场
的面积之比为
.记“每年居民到商场
购物的次数”、“每年居民到商场
购物的次数”分别为
,
,称满足
的区域叫做商场
相对于
的“更强吸引区域”.
与
相距15km,且
.当
时,居住在
点处的居民是否在商场
相对于
的“更强吸引区域”内?请说明理由;
(2)若要使与商场
相距2km以内的区域(含边界)均为商场
相对于
的“更强吸引区域”,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3434e1664f467fabfa28d5f9115f387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de67b8fc083f137ebbb82e6c2ba33cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ab1256702aef4e9f1a5eb6c12ecc96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbd67f60f04c278bdd867fdb3979dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf32171461f12fc1edf54b9ec44efea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e12bfde565540f059dd27ea47dfaa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若要使与商场
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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19-20高一·全国·课后作业
4 . 某收购站分两个等级收购棉花,一级棉花
元/kg,二级棉花
元/kg
,现有一级棉花
kg,二级棉花
kg
,若以两种价格平均数收购,对棉农公平吗?其理由可用不等式表示为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16bdcc6e5ae5a235a228ecc602ff86ea.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/8cb5e5de77ac799e1abd0aa487c6b0ac.png)
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