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1 . 2021年雨水充沛,是一个丰收年.到了夏季,大量新鲜水果上市.现已知某品种苹果失去的新鲜度
与其采摘后的时间
(天)满足关系式:
.若采摘后5天,这种苹果失去的新鲜度为
,采摘后10天失去的新鲜度为
,那么采摘下来的这种苹果至少在多长时间后失去
的新鲜度?( )(已知
,结果四舍五入取整数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b170443c26c44ffb68c9cfb17f0938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f762a1de162d8dca6dcd06a3107c3fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b02d57cd524288750a6a7cbec64cd26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28555fa2f3a09261cb4e0305d390145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8f5b560c5cea567a5e5c3462085b43.png)
A.17天 | B.18天 | C.27天 | D.28天 |
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解题方法
2 . 已知
,
,
均为正数,且
.
(1)证明:
;
(2)若
,求
,
的值,并比较
,
,
的大小.
![](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/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9d6b8819acd3255b5847b232b22a68.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621f48abde2109af335639d0bfb38560.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03516bfa3479baee370ac5b4f55dee7.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/6c1d2e5599453f8d4c04369bc8f79962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43557b716fa38a8aeca410d7c8ba1909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d377db95a1606ee92ebfd986625fc5.png)
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3 . 我们一般使用分贝(符号是
)来表示声音强度(瓦/平方米,符号是
)的等级,强度为
的声音对应的等级为
,科学研究表明,它们满足关系:
,其中
为修正系数(常数),
为普通人能听到的声音的最小强度(常数),清晨时风吹落叶的沙沙声其强度为
,上学高峰时汽车川流不息声音强度达到
,经某科技爱好者用分贝测试仪测得声音等级分别为
和
.
(1)求
与
的值,并求当测得同学们早读声音等级为
时,早读的声音强度;
(2)某天上午体育课进行了测试,同学们非常疲倦,午间教室非常安静,比平常降低了
,求平常中午的声音强度是这天中午声音强度的多少倍?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca586d4c35ce52dec4b545cf13ee0721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db72d10094c3d5cf2cb4eaa4809a1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb217dcf5415d0881240b1637918363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23fdfc8592db67def8fd867f6b6de62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1f35907c8d5fff87642b7805a0b8e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a699a806c147ea608122a0cbaeb8655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65364b0388a18906e906abb5a85fa38d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151468cf33c322f34963314d0a2c489a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59922fee37241fde49e4ac70677b24a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7890b1971fa3f44a946f2c89a4f5fea.png)
(2)某天上午体育课进行了测试,同学们非常疲倦,午间教室非常安静,比平常降低了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b1a1b1e9a0fda0a9071952d47b2baed.png)
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4 . 已知函数
且
.若存在
,使得不等式
对于任意的
恒成立,求实数
的最小值为_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c5dad340991112758226fd3b5dc1f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e30c903d8f8a05332af0b19e7e40df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/308c33e7a29c84cbad2252e44f6acb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd73b03919e2cd703417b4c3c1fe281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ea47220258260d54537f7b5b4be915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 若
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2a79088b624377c5ae50b7a4c54a82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a15cbc4f7be678605ca97bd6c02e15.png)
A.![]() | B.6 | C.![]() | D.3 |
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6 . 证明下列各题:
(1)求证:
;
(2)用综合法或分析法证明:若
,则
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add637eef4cd8802b4eb211aa4f6e572.png)
(2)用综合法或分析法证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf04fe8895c10624636a815d3d752975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da537e5284dc9786845fca39a9ca913.png)
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7 . 方程
的正实数解为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ef7f34ffc1ef24b420f80beee9df2.png)
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7日内更新
|
852次组卷
|
2卷引用:江苏省苏州外国语学校2023-2024学年高二下学期5月月考数学试题
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8 . 已知函数
,
.
(1)求函数
的值域;
(2)设函数
,证明:
有且只有一个零点
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1044dcf4fba551e1b7fbfeb895ea08c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d770179a24541b9d811da5d944cdfa5.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4f3c214da1a20a9ccd33b224531829.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5066adf9157eb0385dc86a44479d91af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/112d3c32a1a43115e1f57a7c910a7840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823a11fc7541e66fb15b95884ce476ee.png)
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9 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a11186577d9a1e0a37742de66121e1.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3dd7b7aff0ddaf92699d89eb6a44bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a11186577d9a1e0a37742de66121e1.png)
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2024-05-06更新
|
551次组卷
|
2卷引用:浙江省杭州市联谊学校2023-2024学年高一下学期5月月考数学试题
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10 . 土壤是自然界中最大的生态系统,具有十分重要的作用.利用绿色化学药剂来降低土壤中的重金属含量是改善土壤环境的一项重要工作,若在使用绿色化学药剂降低土壤中重金属含量的过程中,重金属含量
(单位:
与时间
(单位:
)满足关系式
,已知处理
后,重金属含量减少
,则( )
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b72045c4dfd00534d846aa8a4a30e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933311c0c090e1138e4dd388b7adf8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a55c8261ceaa949d76177fdfa0efdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b29f60fc3d32ca94740f0adf3fd0b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ee628efd6b2f7296c106dd5cbae42f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170b2e2eac5c81d120be3468a2ccddd8.png)
A.![]() | B.![]() ![]() |
C.使土壤中的重金属含量减少一半需要处理约![]() | D.函数![]() |
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