阅读材料:我国著名数学家华罗庚先生曾说:“数缺形时少直观,形少数时难入微,数形结合百般好,隔离分家万事休.”在数学的学习和研究中,常用函数的图象来研究函数的性质,也常用函数的解析式来琢磨函数的图象特征.我们来看一个应用函数解析式研究对应函数图象形状的例子.对于函数
,我们可以通过解析式来研究它的图象和性质,如:图象特征:
(1)在函数
中,由
,可以推测出,对应的图象不经过
轴,即图象与
轴不相交;由
,可以推测出,对应的图象不经过
轴,即图象与
轴不相交;
(2)在函数
中,当
时
,当
时
,可以推测出,对应的图象能分布在第一、三象限;
(3)在函数
中,若
,则
,且当
逐渐增大时,
逐渐减小,可推测出,对应的图象越向右越靠近
轴;若
,则
,且当
逐渐减小时,逐渐增大,可以推测出,对应的图象越向左越靠近
轴;
(4)由函数
可知
,即函数
是奇函数,可以推测出,对应的图象关于原点对称.
结合以上性质,逐步猜想出函数
对应的图象,如图所示:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/a92be779-4fce-4c0c-b960-f436d804f6b4.png?resizew=140)
尝试类比,探究函数
的图象,写出图象特征,并根据你得到的结论,尝试作出函数对应的图象.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
(1)在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c412d5329ba909164329663b7eecdfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57458464618fcf619375a93d3c66d69.png)
(3)在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc4136bd17997e11a7f8abcb19f9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/842c2ef9893cc67e621e272fa0be9926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57458464618fcf619375a93d3c66d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(4)由函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1db6c94b94afc372212a81cc1f4dd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
结合以上性质,逐步猜想出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/a92be779-4fce-4c0c-b960-f436d804f6b4.png?resizew=140)
尝试类比,探究函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0c478693312b42c5dd5f88945f4b746.png)
更新时间:2021-01-30 11:55:59
|
【知识点】 函数基本性质的综合应用
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】定义在
上的函数
满足下列三个条件:①对任意正数a,b,都有
;②当
时
;③![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babc434f884ebe24475f78daac507085.png)
(1)求
的值.
(2)判断函数
在
上的单调性,并用单调性的定义证明.
(3)求满足
的
的集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3d0c2bb35ecce76e98e317587ee472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b666663ce3537a634a3b427b418eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babc434f884ebe24475f78daac507085.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74156327e5659301f391814605688899.png)
(2)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
(3)求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd1db90a9fa449e18eb3050c8bf0f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知函数
.
(1)判断函数
的奇偶性和单调性,并证明;
(2)若对任意实数
,不等式
恒成立,求k的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6db4d7722b60ed3300d38b9d94c0e3d.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若对任意实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fad48c242b2320092f2071921696bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26486b2adbca0ca872611fc0c7e4292c.png)
您最近一年使用:0次