1 . 当
且
时,
对一切
,
恒成立.学生小刚在研究对数运算时,发现有这么一个等式
,带着好奇,他进一步对
进行深入研究.
(1)若正数
,
满足
,当
时,求
的值;
(2)除整数对
,请再举出一个整数对
满足
;
(3)证明:当
时,只有一对正整数对
使得等式
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62d7d74585d13636e5c167a775cb227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f81a1bedc557556e614309feead266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3703709b06e37fb0ed1e7b47f346eef1.png)
(1)若正数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3703709b06e37fb0ed1e7b47f346eef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94174f37421d296a192b2df66c05f875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)除整数对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7204f43679af6935e494c59d40c6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3703709b06e37fb0ed1e7b47f346eef1.png)
(3)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7204f43679af6935e494c59d40c6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3703709b06e37fb0ed1e7b47f346eef1.png)
您最近一年使用:0次
2024-06-08更新
|
211次组卷
|
2卷引用:浙江省培优联盟2023-2024学年高一下学期5月联考数学试题
解题方法
2 . 已知函数
.
(1)若
,
,设函数
,请求出
的值域并求证:
;
(2)若
,
,
,记
,且
是一个三角形的三条边长,请写出方程
的所有正整数解的集合;
(3)若
是一个等腰钝角三角形的三条边长且
为最长边,求证:
在
时恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b5905520c2d7ba5536552341573fa37.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca27cc54ca0332245f5167488daa3408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954e74ff18fc27295263b862e7b559fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a917e05cfca420bd81408cc7a02133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e399dbac2fed2f3f99ef9cfce9b5123a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d508536d0c182db3e7f81a919793de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6996c86f28de1714e1ccd1c4f77aaa51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93521270f25a0bcf1618b39808369f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb6f261914d5f3fdf29325d812af540.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c77befb23ddbca57b9c341f5b9412e.png)
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名校
解题方法
3 . 下列各数中最大的数是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
解题方法
4 . 下列叙述正确的是( )
A.若幂函数![]() ![]() ![]() ![]() |
B.命题“![]() ![]() ![]() ![]() |
C.函数![]() ![]() |
D.函数![]() ![]() |
您最近一年使用:0次
名校
解题方法
5 . 已知函数
,若对于其定义域
中任意给定的实数
,都有
,就称函数
满足性质
.
(1)已知
,判断
是否满足性质
,并说明理由;
(2)若
满足性质
,且定义域为
.
已知
时,
,求函数
的解析式并指出方程
是否有正整数解?请说明理由;
若
在
上单调递增,判定并证明
在
上的单调性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2920db5488d51e8b5d25c5a8aadc12ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68672b2a835adeeaa4d9580d2d9fcc7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e811d5f049f3b6cb9ae6dfe12d3a3f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbb9feeffdbbd6eef8b9c8a61aeb3ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ebb716b8aa64cf3a67871232807b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/567a08e70e5a06c70fbad1d3864061a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e731337c844a9ad4ec7fb221528f87c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2dfaa0e63b9c720093ab80e2ed24c9d.png)
您最近一年使用:0次
2024-03-04更新
|
145次组卷
|
2卷引用:重庆市万州第一中学2023-2024学年高一下学期入学考试数学试卷
名校
解题方法
6 . 给出下列说法,正确的有( )
A.![]() ![]() |
B.若一扇形弧长为![]() ![]() ![]() |
C.命题“![]() ![]() ![]() ![]() |
D.已知命题“![]() ![]() ![]() ![]() |
您最近一年使用:0次
2024-03-01更新
|
304次组卷
|
2卷引用:安徽省亳州市第二完全中学2023-2024学年高一上学期期末教学质量检测数学试题
7 . 噪声污染问题越来越受到人们的重视.我们常用声压与声压级来度量声音的强弱,其中声压
(单位:
)是指声波通过介质传播时,由振动带来的压强变化;而声压级
(单位:
)是一个相对的物理量,并定义
,其中常数
为听觉下限阈值,且
.
(1)已知某人正常说话时声压
的范围是
,求声压级
的取值范围;
(2)当几个声源同时存在并叠加时,所产生的总声压
为各声源声压
的平方和的算术平方根,即
.现有10辆声压级均为
的卡车同时同地启动并原地急速,试问这10辆车产生的噪声声压级
是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501ac320d90eea554d83e8324c9d2cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3951b932908631043c92e8611c315f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca586d4c35ce52dec4b545cf13ee0721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf1c17cfc8419255b5a21c97cdd1514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3606c4a853a6a34cb7f33bea81b15a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e609cd67239d5e2dff7f0ab2075cf775.png)
(1)已知某人正常说话时声压
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ceb35ce23872a70804353a566510aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3951b932908631043c92e8611c315f.png)
(2)当几个声源同时存在并叠加时,所产生的总声压
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366302bf9940078a1577fe018ca85e5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8758ade734dabff565e973fd5f533d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29642bd0dbdb8f0e47afbec42ce460a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3951b932908631043c92e8611c315f.png)
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名校
解题方法
8 . 已知实数
满足
,设
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97dce5cff65ca5568e9580e6a470af7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/523a23279934977bcb9dd25a2e95c5f5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-02-29更新
|
1799次组卷
|
10卷引用:湖南省长沙市雅礼中学2023-2024学年高一下学期第一次月考(4月)数学试题
湖南省长沙市雅礼中学2023-2024学年高一下学期第一次月考(4月)数学试题内蒙古赤峰第四中桥北学分校2024届高三下学期开学摸底联考数学(理)试题陕西省百师联盟2024届高三下学期开年摸底联考理科数学试题(全国卷)陕西省百师联盟2024届高三下学期开年摸底联考文科数学试题(全国卷)河北省百师联盟2024届高三下学期开学摸底联考数学试题江苏省百师联盟2024届高三下学期开年摸底联考数学试题陕西省西安市长安区第三中学2024届高三下学期开学摸底联考理科数学试题陕西省西安市长安区第三中学2024届高三下学期开学摸底联考文科数学试题(已下线)专题02 函数图象及性质(讲义)(已下线)黄金卷08(2024新题型)
名校
解题方法
9 . 临沂一中校本部19、20班数学小组在探究函数的性质时,发现通过函数的单调性、奇偶性和周期性,还无法准确地描述出函数的图象,例如函数
和
,虽然它们都是增函数,但是图像上却有很大的差异. 通过观察图像和阅读数学文献,该小组了解到了函数的凹凸性的概念. 已知定义:设连续函数f(x)的定义域为
,如果对于
内任意两数
,都有
,则称
为
上的凹函数;若
,则
为凸函数. 对于函数的凹凸性,通过查阅资料,小组成员又了解到了琴生不等式(Jensen不等式):若f(x)是区间
上的凹函数,则对任意的
,有不等式
恒成立(当且仅当
时等号成立). 小组成员通过询问数学竞赛的同学对他们研究的建议,得到了如下评注:在运用琴生不等式求多元最值问题,关键是构造函数.小组成员选择了反比例型函数
和对数函数
,研究函数的凹凸性.
(1)设
,求W=
的最小值.
(2)设
为大于或等于1的实数,证明
(提示:可设
)
(3)若a>1,且当
时,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca6d68f1de3e70696f1d5d60affe6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca6d68f1de3e70696f1d5d60affe6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7cd59277a15b4d9063be84a40d5541.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca6d68f1de3e70696f1d5d60affe6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a4ab6155e1fd2c8f9508efa3adcda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca6d68f1de3e70696f1d5d60affe6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f87a3affc8cd30c21af57157d156c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c6933733e82337e6d4a95fc2946ff26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2697ef67790838c84cc238a0334c5d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83aa9d22736190332e01260e5a7803de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b7a76267b71e6fc828cf2a2e81173d.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dd60e2cd1a1aae21a9c07820214290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0823f59998a025e80b46881993e89d1.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01262e3dd65728a29f3bbfa584dccede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7425d1d31f6188375d44137c2b219b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10cda4049695561dab3e0803c3a287fe.png)
(3)若a>1,且当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89c2336e46cbbe2b978d7d8fcd340be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc069f6b9d1623e1c06879cef933e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2024-02-20更新
|
345次组卷
|
2卷引用:山东省临沂第一中学2023-2024学年高一上学期期末模拟数学试题
解题方法
10 . 2023年8月24日,日本政府无视国内外反对呼声,违背应履行的国际义务,单方面强行启动福岛核污染水排海.福岛核污染水中的放射性元素“锶90”的半衰期为30年,即“锶90”含量每经过30年衰减为原来的一半.若“锶90”的剩余量不高于原有的8%,则至少经过(参考数据:
)( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf5114e1dbd4fc973e99293e1fdb3def.png)
A.110年 | B.115年 |
C.112年 | D.120年 |
您最近一年使用:0次