1 . (1)用分析法证明:
(当且仅当
时等号成立);
(2)设
为曼哈顿扩张距离,其中
为正整数.如
.若
对一切实数
恒成立.设
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c76da5edd4633d1fb68e3a4ede06473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd68c14adb3cf12d8f77aec55a053284.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350bc6680b01296d43c94b4d2477c1f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a47a512e82abbcd0a647239620e8be39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70c57ebaf9a10ac167d32017564f027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b72f9f38f5046c8ecd4280b7b14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f916ad5246cc2f42386422d8726ecdfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485a2d99320384a0857b00ce9ab9e990.png)
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2 . 利用分析法证明是从求证的结论出发,一步一步地探索保证前一个结论成立的( )
A.必要条件 | B.充分条件 | C.充要条件 | D.必要条件或充要条件 |
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2023-01-17更新
|
42次组卷
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2卷引用:陕西省米脂中学2021-2022学年高二下学期第一次月考数学(理)试题
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3 . (1)已知
,比较
与
的大小,试将其推广至一般性结论(不需证明);
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033e647fa068419afab6c99f2b6c062d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ca3d6990c78af1743eeacad3cc782e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f781fa116cc0af5da62692e7a95da1.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0f1411c809779e524b3b52cdbcd178.png)
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解题方法
4 . 已知数列
前
项的和为
,满足
,
,
(
).
(1)用数学归纳法证明:
(
);
(2)求证:
(
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a400b5443af7580aa8f0fb7499fe362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032496860d730be8d90309e90fd1c7f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
(1)用数学归纳法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b663a2bf2402567569fa8a904a0d471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a5945ce5c2114af8c18718ca8dc899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
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5 . 用分析法证明:已知
,且
求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9592180b3752b8ace79e7b92f98cec1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2533c09d4efe229490a509902d812566.png)
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6 . 证明:
(1)若
,则
;
(2)求证:当
为正数时,
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ad6cf9fb725f7947bddaf3149ba07d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca34726fb86e4bdeeb4e87778148bf3.png)
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43545d069f7d7c5f87bfdcad4ce63801.png)
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2022-04-08更新
|
362次组卷
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2卷引用:河南省豫北名校2021-2022学年高二下学期4月份教学质量检测理科数学试题
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7 . (1)证明:若
,则
;
(2)已知
,求证:
,
,
不能同时大于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e71f9936d51596dfa7a1eb3fbaa00b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b28c716d53e72489c55897f632f310.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6045d6fcdd88fc44709357ae02da5c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76aac012a59970e1a00e6a55a354ada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/622035ccb4b1d5f64d0efeb6e8d1f6db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79834eca6e3145265514c9e6959952e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
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8 . 下面是由大小相同的小正三角形按一定规律所拼成的几个图案,其中第1个图有1个小正三角形,第2个图有4个小正三角形,第3个图有9个小正三角形,按此规律,用
表示第
个图的小正三角形个数.
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714412955836416/2784563175645184/STEM/67e863780af64409b59297b7e13848d2.png?resizew=326)
(1)试写出
,
的值;
(2)猜想出
的表达式(不要求证明);
(3)证明:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/2021/5/5/2714412955836416/2784563175645184/STEM/67e863780af64409b59297b7e13848d2.png?resizew=326)
(1)试写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32a859898e9905e0524d3a982eb34b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3627e4ccde7d69c49034a4a2d10bee5.png)
(2)猜想出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
(3)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a90e59aea1ddbfdc83161a47874eff.png)
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2021-08-12更新
|
180次组卷
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2卷引用:河南省焦作市2020-2021学年高二下学期期中数学试题
2021高二下·全国·专题练习
9 . 完成反证法证题的全过程.
题目:设a1,a2,
,a7是由数字1,2,
,7任意排成的一个数列.
求证:乘积p=(a1-1)(a2-2)
(a7-7)为偶数.
证明:假设p为奇数,则________ 均为奇数.①
因为7个奇数之和为奇数,故有
(a1-1)+(a2-2)+
+(a7-7)为________ .②
而(a1-1)+(a2-2)+
+(a7-7)
=(a1+a2+
+a7)-(1+2+
+7)=________ .③
②与③矛盾,故p为偶数.
题目:设a1,a2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
求证:乘积p=(a1-1)(a2-2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
证明:假设p为奇数,则
因为7个奇数之和为奇数,故有
(a1-1)+(a2-2)+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
而(a1-1)+(a2-2)+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
=(a1+a2+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
②与③矛盾,故p为偶数.
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10 . 在数列{an}中,a1=2,an+1=
·an(n∈N*).
(1)证明:数列
是等比数列,并求数列{an}的通项公式;
(2)设bn=
,若数列{bn}的前n项和是Tn,求证:Tn<2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94ca02140a3073e385c2cb89313a8e8.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
(2)设bn=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8f1df78a4bb4359f61b378a2975f1e.png)
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2020-11-15更新
|
395次组卷
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7卷引用:广东省深圳中学2022-2023学年高二上学期期中数学试题
(已下线)广东省深圳中学2022-2023学年高二上学期期中数学试题辽宁省大连市滨城高中联盟2023-2024学年高二下学期期中考试数学试卷2017届湖北省黄冈市高三3月份质量检测数学(理)试卷(已下线)专题6.5 数列的综合应用(讲)【理】-《2020年高考一轮复习讲练测》宁夏回族自治区银川市第二中学2019-2020学年高三上学期12月月考数学(理)试题(已下线)专题6.5 数列的综合应用(精讲)-2021届高考数学(理)一轮复习讲练测(已下线)第30讲 数列的综合应用(讲)- 2022年高考数学一轮复习讲练测(课标全国版)