1 . 设
.
(1)
,证明:
;
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114b1d85a3f52a2959c49ec25630dfaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec307143b4bf45106369f256a796d61.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2504fe7020ff898ca5955a423bed0096.png)
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2 . (1)已知
都是正实数,求证:
.
(2)设
,且
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef3052cd1be7641eb559c5d7ed142cb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff6d61a8eaff20b364a9e3235577c69.png)
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3 . 选用恰当的方法证明下列不等式
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679e658fa5679ce73e1b5fdfe434b724.png)
(2)已知
,证明:
.
(3)已知a,b,c均为正实数,求证:若
,则
.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679e658fa5679ce73e1b5fdfe434b724.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa4f85f4d4f4bd9edaa8a964565ca1a.png)
(3)已知a,b,c均为正实数,求证:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a57e060f61f7efa54982bda67db483a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d54c9eb01acfe09c34cb808326cc5e.png)
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4 . (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
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270次组卷
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5卷引用: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
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(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)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
名校
解题方法
5 . 回答下列问题:
(1)用综合法和分析法两种方法证明基本不等式
(
).
(2)对于4个正数a,b,c,d尝试证明
.
(1)用综合法和分析法两种方法证明基本不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf792226cca41c2cf01f5c97874c7864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb83e5f347aac3383335a269b1fc687d.png)
(2)对于4个正数a,b,c,d尝试证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49ff7709866b469e403762cf32f2473.png)
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6 . (1)设
,证明:
;
(2)已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada798eeba5bd19d497bfd0741afd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a737185eb85ca24cf66409ce1e09bc.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9185519a1b1928d6cd4147f43c738145.png)
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2022-09-15更新
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2卷引用:陕西省延安市第一中学2021-2022学年高二下学期期中理科数学试题
7 . (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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8 . 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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3卷引用:河南省商丘市商丘名校2021-2022学年高二下学期期中联考数学理科试题
河南省商丘市商丘名校2021-2022学年高二下学期期中联考数学理科试题上海市七宝中学2022-2023学年高一上学期10月月考数学试题(已下线)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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解题方法
9 . 请选择适当的方法证明.
(1)已知
,
,且
,证明:
;
(2)已知
,
,
,证明:a,b中至少有一个不小于0.
(1)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/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98941347dd7ac01f5e63a6c5930dd5fa.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ade24dfb826c21d8593a3ab5d32d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c99c2a65f7874283fb2f2991002d5f26.png)
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5卷引用:河南省商丘市商丘名校2021-2022学年高二下学期期中联考数学文科试题
10 . 请选择适当的方法证明下列结论:
(1)求证:
;
(2)已知
,求证:
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c1d583e670dac4530bd57ac9118740.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e10cc5dd849caccce37fe98a26c598.png)
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2022-04-02更新
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4卷引用:河南省洛阳市强基联盟2021-2022学年高二下学期大联考数学(文)试题