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1 . 我们知道,声音由物体的振动产生,以波的形式在一定的介质(如固体、液体、气体)中进行传播.在物理学中,声波在单位时间内作用在与其传递方向垂直的单位面积上的能量称为声强I(W/cm2).但在实际生活中,常用声音的声强级D(分贝dB)来度量,为了描述声强级D(dB)与声强I(W/cm2)之间的函数关系,经过多次测定,得到如下数据:
现有以下三种函数模型供选择:
,
,
.
(1)试根据第1-5组的数据选出你认为符合实际的函数模型,简单叙述理由,并根据第1组和第5组数据求出相应的解析式;
(2)根据(1)中所求解析式,结合表中已知数据,求出表格中①、②数据的值(参考数据:
;
(3)已知烟花的噪声分贝一般在
,其声强为
;鞭炮的噪声分贝一般在
,其声强为
;飞机起飞时发动机的噪声分贝一般在
其声强为
,试判断
与
的大小关系,并说明理由.
组别 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
声强I(W/cm2) | 10-11 | 2×10-11 | 3×10-11 | 4×10-11 | 10-10 | ① | 9×10-7 |
声强级D(dB) | 10 | 13.01 | 14.77 | 16.02 | 20 | 40 | ② |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1951ea5ee7b49aa4b9bcc63bdb75fa62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180d83ac0059be8120dc34fe797174be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e621715af060527ebf23f9ab0abe52f3.png)
(1)试根据第1-5组的数据选出你认为符合实际的函数模型,简单叙述理由,并根据第1组和第5组数据求出相应的解析式;
(2)根据(1)中所求解析式,结合表中已知数据,求出表格中①、②数据的值(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff6846b7877f740337f763ac5d42c92.png)
(3)已知烟花的噪声分贝一般在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0551286b983375f51ca32e20c1cb1369.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b28aa623a62d7da19ceade3f37450d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e068b14d21fc7c33880a16bdc05566a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f904e5f274c559bdba741df035ed3461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77339b9543baa617aac49c0a1ab5dc2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7e6fb92c5ba9a90e2d5eb0e72e692f.png)
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2023-05-05更新
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7卷引用:重庆市长寿区2022-2023学年高一上学期期末数学试题(A卷)
2 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f50bd68839a27fde5be2081830e3e8.png)
(1)求
的最小正周期和单调递增区间;
(2)求
在
上的最值以及取得最值时对应x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f50bd68839a27fde5be2081830e3e8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a254ded1e6bfcd711e5e56a903f61e.png)
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解题方法
3 . 如图,在棱长为2的正方体
中,点
分别为棱
的中点, 求证:
(1)
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631a833b17c2071f6c3add54d8eaefde.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/4bb36650-59f3-4d5e-befa-ecaa0ba0b88d.png?resizew=156)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee076fe7dbca5616c4e8a6869a355f4.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f73a0ca4e6c794242489066fddb6c5.png)
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2卷引用:重庆市长寿区2022-2023学年高一下学期期末数学试题(B卷)
解题方法
4 . 已知函数
.
(1)求函数
定义域;
(2)若函数
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de53774745eec3993c1bd4556d3b994.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c82564dd493bf2fe803d0b7f1d44079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
5 . 1.在平面直角坐标系
中,椭圆
:
的离心率为
,焦距为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/be9ccdf9-1a3e-48be-98d0-c5da85f95fd8.png?resizew=221)
(1)求椭圆
的方程;
(2)如图,动直线
:
交椭圆
于A,
两点,
是椭圆
上一点,直线
的斜率为
,且
,
是线段
延长线上一点,且
,
的半径为
,
,
是
的两条切线,切点分别为S,
.求
的最小值及
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/be9ccdf9-1a3e-48be-98d0-c5da85f95fd8.png?resizew=221)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如图,动直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394d3d55b68bd014b2a743da6bc0bbd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b728c0e69820cdcd839e67ffdb1014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f77c7fcf5a32774e6e0c46bb6e3618a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc28b3e3b151b74ace297c6af574cac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d66b83d9dbcb45e1c241d18a3e1843f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6542e3902685bc6c6e7338eeff7db0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0a0f726fad67e97d5864dec65cb5c6.png)
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5卷引用:重庆市长寿区2022-2023学年高二上学期期末数学试题(A卷)
6 . 已知函数
为奇函数.
(1)求实数
的值,判断函数
的单调性并用定义证明;
(2)求关于
的不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4266ae5b43bea012ec6642dfaab78d.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb5dfa29a3e255d6c1bfcf0b9dea9c4.png)
您最近一年使用:0次
解题方法
7 . 如图,四棱锥P﹣ABCD的底面ABCD为菱形,PB=PD,E,F分别为AB和PD的中点.
![](https://img.xkw.com/dksih/QBM/2023/6/29/3270194285666304/3274662805946368/STEM/5f538f37d2df4c978a94f1a0ba80379c.png?resizew=224)
(1)求证:EF∥平面PBC;
(2)求证:平面PBD⊥平面PAC.
(3)若
,求二面角
的平面角的余弦值.
![](https://img.xkw.com/dksih/QBM/2023/6/29/3270194285666304/3274662805946368/STEM/5f538f37d2df4c978a94f1a0ba80379c.png?resizew=224)
(1)求证:EF∥平面PBC;
(2)求证:平面PBD⊥平面PAC.
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d923ad55a426c935e1358b4a0523ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
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8 . 如图,正四棱锥
中.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/92c340fe-bf62-4e59-9153-22c585c440b7.png?resizew=212)
(1)求证:平面PAC⊥平面PBD;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/92c340fe-bf62-4e59-9153-22c585c440b7.png?resizew=212)
(1)求证:平面PAC⊥平面PBD;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9801cabc43c024b9c5fac34b7db5d69b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7d6e5be7914a224e94a7b7e409a79c.png)
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2022-07-08更新
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4卷引用:重庆市长寿区2021-2022学年高一下学期期末数学(B)试题
重庆市长寿区2021-2022学年高一下学期期末数学(B)试题青海省西宁市2022-2023学年高一下学期期末调研测试数学试题(已下线)微专题16 利用传统方法轻松搞定二面角问题(已下线)2023年高考全国乙卷数学(理)真题变式题16-20
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9 . 已知函数
.
(1)若
,解不等式
;
(2)若函数
恰有三个零点
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f95ce313f2d27d825d84786874487d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2e0bb6d63b7bcaee92a470d58cc399.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b8ec9d4206ea66a02de5c4a1e1e911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8d5b7ecc14f3f2adeb7e8ec90acfa.png)
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2023-06-17更新
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2卷引用:重庆市长寿区2022-2023学年高一上学期期末数学试题(A卷)
名校
解题方法
10 . 已知
(a,b均为常数),且
.
(1)求函数
的解析式;
(2)若对
,不等式
成立,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29c2c931f81094bc143488581acc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc6dbd926aa5509b19bb3f38355ed23.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099203c922eda055aa12a7826514b84a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9da03e59bf11e6cd42bff641a65f8e9.png)
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2024-01-18更新
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3卷引用:重庆市长寿区八校2023-2024学年高一上学期1月期末联考数学试题(B)