名校
1 . 用反证法证明:“已知
,若
,则
.”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83eb829e3338a9e4be598124855685e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f45e23d6c42fb01572a8da49c8904e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1565af066e86ef0d751d098176acb6c0.png)
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2 . (1)已知
,用比较法证明:
;
(2)已知
,用基本不等式证明:
,并注明等号成立条件;
(3)已知
,用反证法证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2128a00f52af4427721f0ebba591daa.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a521891098b625f372ff648d110afe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d66530037e9ad08b11dfe515571f41.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937559aeec06323cde8861b17024fc47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be100015cff38b6dfba5080fa94d128.png)
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3 . (1)在
中,角
所对的边分别是
,求证:
中至少有一个角大于或等于
;
(2)已知为不全相等的正数,且
,求
证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d387d228f512ada68fc79c9d5775b077.png)
(2)已知为不全相等的正数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56667aabbe787eb1c3189d487d203e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade63e74fddd1ea3dc2fa0b8561f893d.png)
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解题方法
4 . 已知代数式
和
.
(1)若
,求不等式
的解集;
(2)若
,证明:
、
中至少有一个数不小于
;
(3)若
,不等式
对任意实数
恒成立,试确定实数
、
满足的条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746ccb35a4109e9b8e5de87f4ba7493a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884c3f47ccd7d3a2807f2d6b5cbb1c87.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a601b6112fbde7acad9ad0df5c1ab94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c5c427ad83ed2b2988005eaf27d7c8a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76fa77d1b0bc4c1af9c8c41bf0dabe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746ccb35a4109e9b8e5de87f4ba7493a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884c3f47ccd7d3a2807f2d6b5cbb1c87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9628e46f99dce96288779420e458e7b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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5 . (1)已知实数
满足
,求证:
.
(2)已知实数
满足
,用反证法证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2128a00f52af4427721f0ebba591daa.png)
(2)已知实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/127a0d8c1c7d15ed40ec4b8bca0ebdf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485a2d99320384a0857b00ce9ab9e990.png)
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解题方法
6 . (1)实数
,比较
与
的大小;
(2)证明:
是无理数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2582892eba557b99dbe879efb9754d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8b00099c87d4771161c1eedad1c5f0c.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
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解题方法
7 . 设
是四个正数.
(1)已知
,比较
与
的大小;
(2)已知
,求证:
中至少有一个小于1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec99c57bf7997bd93e1ed8f48d5af9a.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b786605eb0e76372cdf6ea8b804f0ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1edc67030391d9b9005aa433345f0657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4713d1f4fd705bde1f54ab05ff4fec97.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5a464804f943a8ee1dfc7f19b42d5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec99c57bf7997bd93e1ed8f48d5af9a.png)
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8 . 给定的正整数
,若集合
满足
,则称A为集合M的n元“好集”.
(1)写出一个实数集
的2元“好集”;
(2)证明:不存在自然数集N的2元“好集”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac19e2a797cd0a408316988a63b3755.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74dc40fc087732c80dc3d4c03abfd198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1844f943af2342324b78f5a0ee577425.png)
(1)写出一个实数集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933093b52cca887f597cbe22a5467b11.png)
(2)证明:不存在自然数集N的2元“好集”.
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2022-09-06更新
|
408次组卷
|
3卷引用:上海市洋泾中学2021-2022学年高一上学期10月月考数学试题
上海市洋泾中学2021-2022学年高一上学期10月月考数学试题广东省深圳市深圳外国语学校2022-2023学年高一上学期第一次月考数学试题(已下线)重难点01集合与常用逻辑用语(9种解题模型与方法)(2)
9 . 已知集合
,
,且
.用反证法证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e5c8e41ca398306415e79504e75e55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0237fe6d9bb13786090f32de705dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6824a6128d76a1c759e49d575c741311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b86114ceef4652b0798e1a2a907b87d.png)
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10 . 已知全集
,集合
,
,且
.
(1)用反证法证明
;
(2)若
,求实数a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860ebb6f76cd3cb9a265dfc233002a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e5c8e41ca398306415e79504e75e55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0237fe6d9bb13786090f32de705dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6824a6128d76a1c759e49d575c741311.png)
(1)用反证法证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b86114ceef4652b0798e1a2a907b87d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928cd155cf20033821c58ab602111bd6.png)
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