1 . (1)用长度分别为2,3,4,5,6的细木棒围成一个三角形(允许连接,但不允许折断),求能够得到的三角形面积的最大值与最小值;
(2)若用
条长度分别为
,
,…,
的细木棒围成三角形,你能发现三角形面积的变化规律吗?写出从中发现的两条规律.
(2)若用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49dac16bbcffa236fbee961ada16420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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2 . 证明不等式:
(1)若
,
且
,则
;
(2)若
,
是实数且
,则
;
(3)把(1)和(2)中的不等式推广到一般情形,并证明你的结论.
(1)若
![](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/bb82da7d6889d032ece3f1b1dc10d571.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4937e38b3dee8128e5b9914e0a055b.png)
(3)把(1)和(2)中的不等式推广到一般情形,并证明你的结论.
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3 . 证明下列不等式:
(1)若
,则
;
(2)对任意
,有
;
(3)对任意
,有
;
(4)若
,则
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c74bc05ba2e70080935ad46836f134de.png)
(2)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40865b13c775d3f26490aba72d5deb5d.png)
(3)对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c197486dfb1671a5f3b33ac8d4c6dbdf.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be670d32e753012125c503f2f3be56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d8eb08f685cda451c7ceaa42008931.png)
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21-22高一·湖南·课后作业
4 . 利用不等式的性质证明下列不等式:
(1)若
,
,则
;
(2)若
,
,则
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75807858b7804a1ad2039c41f323a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5197a4059d79e7ad2954b387d17d1ac8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ab74d7f34dda733dca9aa3dac2a282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557f1c548c99f9b3a96ad97155617148.png)
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2022-02-23更新
|
619次组卷
|
8卷引用:3.1 不等式的基本性质 (1)
(已下线)3.1 不等式的基本性质 (1)(已下线)2.1 等式性质与不等式性质精练-【题型分类归纳】(已下线)专题2.1 等式性质与不等式性质-举一反三系列湘教版(2019)必修第一册课本习题 习题2.1(已下线)习题2.1(已下线)专题15 等式性质与不等式性质-2022年暑假初三升高一数学衔接知识自学讲义(人教A版2019)(已下线)突破2.1 等式的性质与不等式的性质(课时训练)(已下线)第05讲 等式性质与不等式性质(7大考点)-2022-2023学年高一数学考试满分全攻略(人教A版2019必修第一册)
21-22高一·湖南·课后作业
5 . 某商品计划提价两次,有甲、乙、丙三种方案,其中
.经两次提价后,哪种方案提价的幅度大?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3fc6114cb8f086faab5828f8297f8e.png)
方案 | 第一次提价 | 第二次提价 |
甲 | ||
乙 | ||
丙 |
您最近一年使用:0次
2022-02-23更新
|
146次组卷
|
3卷引用:湘教版(2019)必修第一册课本习题 习题2.1
21-22高一·湖南·课后作业
6 . 比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1567f3ba3dd484d885a134239b6a7496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41d3f5345d3af16392fc6da4e669459.png)
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20-21高一·江苏·课后作业
7 . 甲、乙两同学分别解“设
,求函数
的最小值”的过程如下:
甲:
,又
,所以
.
从而
,即y的最小值是
.
乙:因为
在区间
上的图象随着x增大而逐渐上升,即y随x增大而增大,所以y的最小值是
.
试判断谁错,错在何处?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4318a47d7e83d587e74bab4d3d1f6883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2751c5819303b8e60add2356bd7c808b.png)
甲:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7833f1728bed812cd05321fdae104d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca195cc5a87ca48a861db1d86f5dbf33.png)
从而
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35510c7852e4f698522f808de475984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
乙:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2751c5819303b8e60add2356bd7c808b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb49dbba01c4ff5f686ffc8828351b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209a95bdee4d5e56dd0e165d3e794d18.png)
试判断谁错,错在何处?
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