1 . 新教材人教B版必修第二册课后习题:“求证方程
只有一个解”.证明如下:“化为
,设
,则
在R上单调递减,且
,所以原方程只有一个解
”.类比上述解题思路,解不等式
的解集是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c18c032d75893db45e61e6c4eb0d4e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cfb1e9557770560280b5248ae2d0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856491b01dab707170d83a1bc4b1f257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db7707d6b2754808adefc9b2fb976a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bff0b1f5d48604afa226104cf44a07f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2022-05-05更新
|
209次组卷
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2卷引用:河南省济源市2021-2022学年高二下学期期末教学质量调研模拟试题(三)数学(文)试题
解题方法
2 . 观察下面的解答过程:已知正实数a,b满足
,求
的最小值.
解:∵
,
∴
,
当且仅当
,结合
得
,
时等号成立,
∴
的最小值为
.
请类比以上方法,解决下面问题:
(1)已知正实数x,y满足
,求
的最小值;
(2)已知正实数x,y满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57f879f6e8df7d5fb261328806260b3.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e312ceb0190fdd2b5481cc456417c2c.png)
当且仅当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c34bb88b7df81b0a9cc4f5f532f529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f86c800af77b70d7799500a45f91721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddab9f2cdfbb37f5d5845e7943910624.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57f879f6e8df7d5fb261328806260b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3755d7e08b98c26303f2f61de7e7ddd2.png)
请类比以上方法,解决下面问题:
(1)已知正实数x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08677c8308807e4dca6fd9410d301a39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/407e4330cfdd5cd0bcfd4f3bd1a898e6.png)
(2)已知正实数x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08d643ad258c07374425f3dfd3e07e1c.png)
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3 . 线性分形又称为自相似分形,其图形的结构在几何变换下具有不变性,通过不断迭代生成无限精细的结构.一个正六边形的线性分形图如下图所示,若图1中正六边形的边长为1,周长与面积分别记为
,
,图2中所有正六边形的周长之和与面积之和分别记为
,
,以此类推,图n中所有正六边形的周长之和与面积之和分别记为
,
,其中图n中每个正六边形的边长是图n-1中每个正六边形边长的
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931921057390592/2939137784922112/STEM/7bc8a3a64d0e4959ab1acabd12940f89.png?resizew=302)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/2022/3/8/2931921057390592/2939137784922112/STEM/7bc8a3a64d0e4959ab1acabd12940f89.png?resizew=302)
A.图4中共有294个正六边形 |
B.![]() |
C.![]() |
D.存在正数m,使得![]() |
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2022-03-18更新
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2卷引用:河南省新乡市2021-2022学年高三上学期期末考试数学(文科)试题
4 . 观察下列各等式:
,
,
.
(1)请选择其中的一个式子,求出a的值;
(2)分析上述各式的特点,写出能反映一般规律的等式,并进行证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b8a553ae73d07e0e3c32660237717a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d705edf3c9236279a236db0df45fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd75413260f92d7493d477c560fa478.png)
(1)请选择其中的一个式子,求出a的值;
(2)分析上述各式的特点,写出能反映一般规律的等式,并进行证明.
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2022-03-10更新
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2卷引用:河南省信阳市2021-2022学年高一上学期期末数学试题
5 . 观察如图所示的三角形数阵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814397354c2ae1cb08e0271305970811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feda926749de04fa585f73f84c568f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
根据规律可得该数阵第
行第
个数为______ ,第
行各个数之和为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c748e40ba21ac5063d3bccaa57ef278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814397354c2ae1cb08e0271305970811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5453184e251cfe787b5965cd38426962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feda926749de04fa585f73f84c568f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
根据规律可得该数阵第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
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6 . 把正整数按一定的规则排成了如图所示的三角形数阵,设
(
,
)是位于这个三角形数阵中从上往下数第
行,从左往右数第
列的数,若
,则
与
的值分别为( )
![](https://img.xkw.com/dksih/QBM/2021/9/25/2815785353912320/2816188245090304/STEM/a15749c230b741bc95db630ede64c6d3.png?resizew=224)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a14c188b1c9d61aa237b137ba18023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a85359bb803e1d526b2618a2aaf54e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d7d9dd26c9feab447266456e8a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://img.xkw.com/dksih/QBM/2021/9/25/2815785353912320/2816188245090304/STEM/a15749c230b741bc95db630ede64c6d3.png?resizew=224)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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7 . 某同学在一次研究性学习中发现,以下四个式子的值都等于同一个常数:
①
;②
;③
;④
.
(1)试从上述式子中选择一个,求出这个常数;
(2)根据(1)的计算结果,将该同学的发现推广为三角恒等式,并证明你的结论.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d279d9f25f3917667c42a4f1e5eaa9fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0472de91bab2fbf3a06212c3829361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb82f6e8e5c8638add14e9a004918ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83af203eb16184ce04dcfff294274538.png)
(1)试从上述式子中选择一个,求出这个常数;
(2)根据(1)的计算结果,将该同学的发现推广为三角恒等式,并证明你的结论.
您最近一年使用:0次
名校
8 . 二维空间中,圆的一维测度(周长)
,二维测度(面积)
,三维空间中,球的二维测度(表面积)
,三维测度(体积)
应用合情推理,若四维空间中,
特级球”的三维测度
,则其四维测度
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8469d348cd31a3a1429e0828954d6164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50390afd2cf9ed105ad1f9e1873d7f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68159e318b99528a6e641f9b8804ec8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f7c2b9cb9c08a25bbdd7c0e4bdff48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420619830fd8100cd81a42597cb7cbbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f0c38d83113af52b14095c052a44fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4db8437c6d4376b55bdceed535b0bb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2021-08-02更新
|
216次组卷
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2卷引用:河南省南阳市2020-2021学年高二下学期期末数学(理科) 试题
9 . 观察下列各式:
,
,
,
,……,则下列各数的末四位数字为8125的是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94eef5c23ca2c4254152b804ec9243e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff01a0558f409ca533973aff718b2a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae05f3a35308132c0537eae3023bc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62e1fc63be8817cb1ef30cefc78d5c6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 已知函数
且
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1b52a92fd3dc776c43fa5ff1e3be9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e3c2102e6bc421d294d067af1b1988.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e34b635ae820c490d6a6863ae9062c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5e0ebf92430345eba5bed50683dc20.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2021-08-01更新
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87次组卷
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2卷引用:河南省开封市2020-2021学年高二下学期期末考试数学(理)试题