我们为了探究函数
的部分性质,先列表如下:
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056356525998080/2057015770947584/STEM/a23a3d18df3646909289fd332df812d8.png?resizew=640)
观察表中
值随
值变化的特点,完成以下的问题.
首先比较容易看得出来:此函数在区间
上是递减的;
(1)函数
在区间 上递增
当
时,
= .
(2)请你根据上面性质作出此函数的大概图像;
(3)试用函数单调性的定义证明:函数
在区间
上为减函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/490042d09321998b96bb41a69e86f7b7.png)
… | 0.5 | 1 | 1.5 | 1.7 | 1.9 | 2 | 2.1 | 2.2 | 2.3 | 3 | 4 | 5 | 7 | … | |
… | 8.5 | 5 | 4.17 | 4.05 | 4.005 | 4 | 4.004 | 4.02 | 4.04 | 4.3 | 5 | 5.8 | 7.57 | … |
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056356525998080/2057015770947584/STEM/a23a3d18df3646909289fd332df812d8.png?resizew=640)
观察表中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
首先比较容易看得出来:此函数在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094cba781181aeb90752170e9ba6c94.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ab1b1fc93035cc209fe9c0f0a3044d.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757d94bfb49ff071d61c740016b4b1f0.png)
(2)请你根据上面性质作出此函数的大概图像;
(3)试用函数单调性的定义证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4426903eb63c0cf1b8e19d97f25398f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b094cba781181aeb90752170e9ba6c94.png)
更新时间:2018-10-19 15:52:12
|
相似题推荐
解答题-作图题
|
较易
(0.85)
解题方法
【推荐1】如图,正方形
是边长为4,动点
以每秒1个单位长度的速度从点
出发,沿折线
运动,动点
以每秒1个单位长度的速度同时从点
出发,沿折线
运动,当两者相遇时停止运动.设运动时间为
秒,
的面积为
.
(1)请直接写出
关于
的函数表达式并注明自变量
的取值范围;
(2)在给定的平面直角坐标系中画出这个函数的图象,并写出该函数的一条性质;
(3)结合函数图象,直接写出
的面积为6时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3087da5c11909dab613378fee8d471fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccfc06739ab01294379f26e1c8124a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/aeb6f124-b3da-415b-b233-e01c4546c47c.png?resizew=354)
(1)请直接写出
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在给定的平面直角坐标系中画出这个函数的图象,并写出该函数的一条性质;
(3)结合函数图象,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-问答题
|
较易
(0.85)
名校
【推荐3】已知函数
是定义在
上的偶函数,且在
上是增函数.
(1)比较
与
的大小;
(2)若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6ffa6fe2387ee19234c2ad0fcb92ea.png)
(1)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6781b4bb6a4970581cc88004a2546850.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14be574d4eaf7f7e0d2b28ade7f3ea1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5fb4b9bc336dd966dec41ae54b4789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-证明题
|
较易
(0.85)
名校
解题方法
【推荐1】已知函数
.
(1)若
是奇函数,求实数
的值;
(2)若
,试用函数单调性定义证明:函数
在
上单调递增.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5394663cf16458840af24207f7b272eb.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
您最近一年使用:0次
解答题-问答题
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较易
(0.85)
【推荐2】已知函数
.
(1)当
时,判断函数
在
和
上的单调性,并用定义法证明
时,
的单调性;
(2)若
的值域 为
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd93fc4b44418c6f0af6b67db140a8b.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a7d760a493dbee460971977a64fa16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066fc8a22baa9d7f1666f325d65fc9c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5262e887e803e66a01b5967cc805a50e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84c5c7a0075f3d31a6def4fbf641dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b029e85e686623cdef977b2cb1f207a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次