已知函数
是定义在R上的奇函数,且当
时,
.
(1)当
时,求函数
在
上的解析式;
(2)若函数
为R上的单调递减函数,
①求实数
的取值范围;
②若对任意的实数
,
恒成立,求实数
的取值范围,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6f28b64c012bf22890a7ac69f59a70.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22a4a0dd7307a1323d25331e60782d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2edd8edcb21bd41584daf9bb95a5c7.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
①求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②若对任意的实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9defce4ef0cbf162a2ca402a8e369b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2022-11-09 10:26:19
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解答题-作图题
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【推荐1】已知
,其中
且
,
.
(1)求函数
的解析式,并画出图象;
(2)若
在区间
上是单调函数,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c29da084429a7a66822fd08338f99087.png)
![](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/59988442648c40c373c5cd1f74b94caa.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987ee644169ad93379283ae715d8ebf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】将函数
的图象向右平移1个单位得到
的图象.
(1)若
,求函数
的值域;
(2)若
在区间
上单调递减,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d98354515a2dc0ce3a0bee52e3d5c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f82b9def474c9e815d830284fb2701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b469f31458c14208fddf45ff9cc81c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-问答题
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名校
解题方法
【推荐1】已知函数
是定义在
上的偶函数,且当
时,
.
(1)求当
时,
的解析式;
(2)如图,请补出函数
的完整图象,根据图象直接写出函数
的单调递增区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2b74d89854116e411c089d053df053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5397ee1eb6d157f6ec1e7a878f8d16e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/20/2f918427-8780-48a0-adf4-9086e3537782.png?resizew=167)
(1)求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)如图,请补出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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【推荐2】已知f(x)=
是定义在[-1,1]上的奇函数,且f(-
)=
.
(1)求f(x)的解析式;
(2)用单调性的定义证明:f(x)在[-1,1]上是减函数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0f3e3d95e6aaf0534c9e6ca2b20821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60b42a794f60bb387e97f4dee1b26d0.png)
(1)求f(x)的解析式;
(2)用单调性的定义证明:f(x)在[-1,1]上是减函数.
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解题方法
【推荐1】设
为定义在R上的偶函数,当
时,
;当
时,
,直线
与抛物线
的一个交点为
,如图所示.
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859740805808128/2863166212407296/STEM/575f47b9c20c49a3a916c22f0b958615.png?resizew=258)
(1)补全
的图像,写出
的递增区间(不需要证明);
(2)根据图象写出不等式
的解集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a256c187e1c577afddcd41a75ebd351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1b0b10083d43c9feb9f9d540a0f5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c6cf9152e0d02b83eb22b01722d29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8021d9dd9a936f8726f02d376553754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1b0b10083d43c9feb9f9d540a0f5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8021d9dd9a936f8726f02d376553754.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859740805808128/2863166212407296/STEM/575f47b9c20c49a3a916c22f0b958615.png?resizew=258)
(1)补全
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
(2)根据图象写出不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a1b1fdcdde97a8c9e9339b2f33c5d8.png)
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解答题-证明题
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解题方法
【推荐2】 若定义在
上的函数
同时满足下列三个条件:
①对任意实数
均有
成立;
②
;
③当
时,都有
成立.
(1)求
,
的值;
(2)求证:
为
上的增函数
(3)求解关于
的不等式
.
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/625481183b8d4d539f75f0d71be68260.png)
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/e440ac2807b5408084c915610f27b888.png)
①对任意实数
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/c50447091f7b4a41a4c47941e772c97e.png)
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/3be2b398bb2145ed94290f04a890da6b.png)
②
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/22717ba8b837494ab3eb2076959a4f48.png)
③当
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/0734c43183034f96b62cf162c483800e.png)
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/9ba3f7d896464ff7b5a14e73bbd432ed.png)
(1)求
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/ecb2274290f44980962a01652b2969cb.png)
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/ff87954c891d4d1db53d4f7984a2f8d1.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/e440ac2807b5408084c915610f27b888.png)
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/625481183b8d4d539f75f0d71be68260.png)
(3)求解关于
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/2ab94d64e4bb4f119104161d8326f492.png)
![](https://img.xkw.com/dksih/QBM/2011/10/28/1577542382977024/1577542383509504/STEM/e6b243fbb39146779442ee09c849e963.png)
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解答题-证明题
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【推荐3】已知定义域为
的函数
是奇函数.
(1)求实数
的值;
(2)试判断
的单调性,并用定义证明;
(3)解关于
的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9f333cee2ccb2b215d93011a162f7a.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036ab99cc2e6cfabfa2e32307d205899.png)
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解题方法
【推荐1】若
是定义在
上的奇函数,且
为增函数,求不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455ba3d3e46977fcbe5b71f8bb9df4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a145cfc9adee57b260ea5e3a9191ef76.png)
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【推荐2】已知函数
,且
.
(1)证明:
在定义域上是奇函数;
(2)判断
在定义域上的单调性,无需证明;
(3)若
,求
的取值集合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d612b55aa3472f9340acd2fcd8b77b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4266704cf6a09ed98228ee26d91f402c.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a29b9854dee6880cf39e720e33e47fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解题方法
【推荐3】已知
是定义在
上的函数.
(1)判断
的奇偶性;
(2)若
在区间
上是减函数,解不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bbc8a117e13345965faa4afe02c258e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a669b7345ccfe4cfbe6de2765f1fd74.png)
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