名校
解题方法
1 . (1)已知b克糖水中含有a克糖
,再添加m克糖
(假设全部溶解),糖水变甜了.我们将这一事实表示为不等式:当
时,有
,请证明这个不等式;
(2)设
的三边长分别为
,请利用第(1)问已证不等式证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d49655ebe52ed0e7561f0da99cbe9fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111f948bc9a44eef670a04f31e4dedd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0ba96a400a4c158eefc9648b0c130c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16171f1f79d33dbdf4e2dc280b16943.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13a05f5aca98574bb1f927123490de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f4233a7afad30d1ae8f8cda1901a9e.png)
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2022-10-23更新
|
270次组卷
|
5卷引用:第二章 一元二次函数、方程和不等式单元复习提升-速记·巧练(人教A版2019必修第一册)
(已下线)第二章 一元二次函数、方程和不等式单元复习提升-速记·巧练(人教A版2019必修第一册)四川省眉山市彭山区第一中学2022-2023学年高一上学期10月月考数学试题福建省莆田第一中学、擢英中学2023-2024学年高一上学期10月月考数学试题云南省昆明市第八中学2023-2024学年高一上学期12月月考数学试题陕西省西安市鄠邑区2022-2023学年高二下学期期中模拟理科数学试题
2 . 已知
,
.请选择适当的方法证明.
(1)若
,证明:
;
(2)若
,证明:
与
不能同时成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98941347dd7ac01f5e63a6c5930dd5fa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca27cc54ca0332245f5167488daa3408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656cacf9b32ce8f718dcb50bc8994593.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f678dde8a2f44b8eae985b11bf4b50.png)
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2022-05-05更新
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3卷引用:专题04常用逻辑用语-【倍速学习法】(沪教版2020必修第一册)
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3 . 已知a,b,c都是正实数,
,用三种方法证明:
.
(1)分析法;
(2)综合法;
(3)反证法.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8845c0d06613fabb0358d5392cca38b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f00cfcbd5f96bab94e532a2e79204e.png)
(1)分析法;
(2)综合法;
(3)反证法.
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2021-11-14更新
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3卷引用:2.2.1 不等式及其性质
4 . (1)求证:
;
(2)已知
,
,且
,用反证法证明:
和
中至少有一个小于2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b3d03b6098d2f3f30d213d830d6a84.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bbd0aae5a4f6129fc78f88f662f092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5360e1dce424ae202f4ca4e5b842499f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361751a03c628b8ddb0952a7390f7810.png)
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4卷引用:1.2反证法(第3课时)
5 . 已知
.
(1)若
,
,证明
为锐角三角形;
(2)如图,过顶点
作
,垂足
位于边
上.若
且
,证明
不是直角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32841dea3e0f06078e09450d29dbfac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994eeb7944c572291623825627af7ea2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图,过顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacfdde1c91d4404be2fdf515a03437d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/f9272433-89e2-4fe7-9df7-e62ab88224ad.png?resizew=168)
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6 . 按照要求证明下列不等式.
(1)已知
,用综合法证明:
;
(2)用分析法证明:
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb54b1b3617ebc502cb44194cbcd1dc.png)
(2)用分析法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceed227c026ff8d94237c63ace92cf78.png)
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7 . (1)证明:
,对所有实数
均成立,并求等号成立时
的取值范围.
(2)求证:
是无理数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4e87bd6addd7ad01e563856c068e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8242dce48218efc02663b59905fb7df.png)
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8 . (1)设
,用综合法证明:
.
(2)设
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada798eeba5bd19d497bfd0741afd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a737185eb85ca24cf66409ce1e09bc.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1caa2030ac2f57deccc5b24e940facc9.png)
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2021-04-02更新
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3卷引用:2.2.1 不等式及其性质
9 . 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e8fedb84a06a448859846470d18f4b.png)
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2卷引用:沪教版(2020) 必修第二册 领航者 延伸阅读
10 . ⑴当
时,求证:
;
⑵已知
,
.试证明
至少有一个不小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03425cbe241074fd29fa5bb2b1da5820.png)
⑵已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39f015b400f6a000a581ef05c9f814ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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2018-01-20更新
|
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6卷引用:1.2反证法(第3课时)
(已下线)1.2反证法(第3课时)上海市实验学校2020-2021学年高一上学期期中数学试题(已下线)第1章集合与逻辑精讲精练-2020-2021学年高一数学期末考试高分直通车(沪教版2020,必修一)上海市南洋模范中学2022-2023学年高一上学期10月月考数学试题上海市曹杨第二中学2023-2024学年高一上学期第一次月考(10月)数学试题江苏省泰州市2017-2018高二第一学期期末考试数学(文科)试题