21-22高一·湖南·课后作业
1 . 已知:
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e93622d238a10ef084d02a25e7d6e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46c90b74747b4fbe7a10577158e998c.png)
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2 . 已知
,
,对任意的实数
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7326ea56be82bd616fec7e6aa3c884c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c624ba61a6885c1b81ec8d6c9307ecfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad481cbfb67ac9cdbc0537f3de23b022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846ab1c77d4cd15dda12ed65a910ad40.png)
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21-22高一·湖南·课后作业
解题方法
3 . 证明不等式:
(1)若
,
,
,
都是正数,求证:
;
(2)若
,
,
是非负实数,则
;
(3)若
,
是非负实数,则
;
(4)若
,
,则
.
(1)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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e7387a3fbab6508695365955f55258.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d92a6b95fdfdedb405447340293bdc.png)
(3)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/727ff3ac24b506706045956c16336f94.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19339e3904e9541ff26b30ae5f1242b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f58b9bc974b789928f6490acb43fb3.png)
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21-22高一·湖南·课后作业
4 . 如图,矩形ABCD的相邻两条边AB,BC的长度分别为1和3,点E,F是BC的三等分点,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67207077ac81e66c05f8e210bcb84862.png)
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20-21高一·江苏·课后作业
5 . 已知
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c83dbba8b54b45b0698bfa6e329c8b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4bf885e5b0189a3e4872d32cef879c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c21575857b85e878ba44698c60062d.png)
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20-21高一·江苏·课后作业
6 . 设
,
,求证:函数
(
)是奇函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddf8a1b627d03965224abe9dbdf48d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
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20-21高一·江苏·课后作业
7 . 一铁棒欲通过如图所示的直角走廊.试回答下列问题:
![](https://img.xkw.com/dksih/QBM/2021/10/30/2840648913543168/2840718650703872/STEM/82d1525a-fc75-42e1-a701-e68c15cb447d.png?resizew=222)
(1)证明:棒长
;
(2)当
时,作出上述函数的图象(可用计算器或计算机);
(3)由(2)中的图象求
的最小值(用计算器或计算机);
(4)解释(3)中所求得的L是能够通过这个直角走廊的铁棒的长度的最大值.
![](https://img.xkw.com/dksih/QBM/2021/10/30/2840648913543168/2840718650703872/STEM/82d1525a-fc75-42e1-a701-e68c15cb447d.png?resizew=222)
(1)证明:棒长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c32c82a95b1c335fa4b64d242eb4f96.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5caabda288fc01cc168938846eec5d2.png)
(3)由(2)中的图象求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6eb532cf48aa754a0a0731a88c731b.png)
(4)解释(3)中所求得的L是能够通过这个直角走廊的铁棒的长度的最大值.
您最近一年使用:0次
2021-10-30更新
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6卷引用:第七章本章回顾
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