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1 . 明朝科学家徐光启在《农政全书》中用图画描绘了筒车的工作原理(如图).假定在水流量稳定的情况下,筒车上的每一个盛水筒都做逆时针匀速圆周运动,筒车转轮的中心O到水面的距离h为1.5m,筒车的半径r为2.5m,筒转动的角速度
为
,如图所示,盛水桶M(视为质点)的初始位置
距水面的距离为3m,则3s后盛水桶M到水面的距离近似为( )(
,
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ea20ecbd481884949b6378230040c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9f50605db5d5f8f3a01ee8e474a112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a929d0d84e3654f03694adc8d1a326e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a7ff6bb8000946da9599d7d903ac9a.png)
A.4.5m | B.4.0m | C.3.5m | D.3.0m |
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2024-06-14更新
|
472次组卷
|
2卷引用:重庆市沙坪坝区部分学校2023-2024学年高一下学期4月阶段检测数学试题
解题方法
2 . 已知正数
满足
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9defa23d2a9b88f4dd10e0ea4bef2189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131ac7eb1e911c9a40e84235bf3742ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/273b63fc788388fab8b4f685fdb83230.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
3 . 正弦波是频率成分非常单一的信号,其波形是数学上的正弦曲线,任何复杂信号,如光谱信号,声音信号等,都可由多个不同的正弦波复合而成,现已知某复合信号由三个振幅、频率相同的正弦波
,
,
叠加而成,即
,设
,
,
,
,若图中所示为
的部分图象,则下列描述正确的是( )
A.![]() |
B.![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() |
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解题方法
4 . 已知函数,
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5828873f8369183faf71181cda5b61d2.png)
(2)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fd7af568e3d9f444beb0ff41426477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bd24e647a626899a243a3f3984f90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23d71715e6c2b6ccefb4161d9e3641d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 在平面直角坐标系中,已知
,动点
到
轴的距离为
,且
.
(1)求动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63caa7e958f171d9dbc9424fc4ea4339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/6619883500131ca27c672a58bc213672.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/b556b1a9944719cf423e90f8df16c773.png)
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6 . 已知函数
,
,
,令
,
.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2fc102eefee36185e3863b742df6290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/249a976e88133f3b3733f09137cf5c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762fee662775c2b27c4b3ef8910ef157.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e92903b4ad4fc018c9f7d0309ed20403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc85a01f2a5b003d545aabd58658f430.png)
A.![]() ![]() | B.数列![]() |
C.![]() | D.![]() |
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解题方法
7 . 已知
的内角
,
,
所对应的边分别是
,
,
,
,
,
,则
的面积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cde553403973ef8d82f2e714cb7939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42190fdb24c6e918e06eb4a2ebf8856f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d803e27871810c6b8a7d6169144dd61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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8 . 下列命题中正确的是( )
A.若向量![]() ![]() ![]() ![]() |
B.若非零向量![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
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9 . 如图,几何体
中,
和
均为等边三角形,平面
平面
,
,
,
,
为
中点.
、
、
、
四点共面;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1e3a43d0fa18f6c0888ba804d5b329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55340588bd240bc8bbe484f3037fd71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9641d01140939c44450bf39773272af6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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2024-03-23更新
|
1215次组卷
|
2卷引用:重庆市南开中学校2023-2024学年高三下学期第七次质量检测数学试题
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10 . 在一个抽奖游戏中共有
扇关闭的门,其中
扇门后面有奖品,其余门后没有奖品,主持人知道奖品在哪些门后.参赛者先选择一扇门,但不立即打开.主持人打开剩下的门当中一扇无奖品的门,然后让参赛者决定是否换另一扇仍然关闭的门.参赛者选择不换门和换门的获奖概率分别为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dfdc9d5b0fbcf03a8c14f307ca60ef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb71c47c398ea5e6dd9f5fc2eac71d.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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