解题方法
1 . 已知定义在R上的函数f(x)=
是奇函数.
(1)求实数a的值;
(2)用定义证明f(x)在R上是减函数;
(3)已知不等式f(logm
)+f(﹣1)>0恒成立,求实数m的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572532969013248/1572532975157248/STEM/d0776c70ef8144efa5c66a20a98d6c32.png)
(1)求实数a的值;
(2)用定义证明f(x)在R上是减函数;
(3)已知不等式f(logm
![](https://img.xkw.com/dksih/QBM/2016/3/11/1572532969013248/1572532975157248/STEM/c8ac0c912294498ca128c65038ad7132.png)
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解题方法
2 . 定义域为
的函数
满足:对任意的
有
,且当
时,有
,
.
(1)证明:
在R上恒成立;
(2)证明:
在
上是减函数;
(3)若
时,不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de18c5ae806d998e6b7a035d2c2e1da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b253bed990e08769d68d3d0c32eb69c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7fde71807463dbdfd8fce1655a5a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6536528d13d326f3c8f0b41e8266bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e37c94f22f621f6952e100cd6c2d3b0.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca88b72ac8dc9c7c137af932de90bc7.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7fde71807463dbdfd8fce1655a5a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7eb42e1ab57ceb445deb84ff70b166.png)
![](https://img.xkw.com/dksih/QBM/2016/1/13/1572433815478272/1572433821515776/STEM/8289d9c06b6e4502bd1d343036172b58.png)
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解题方法
3 . 已知点
在函数
的图象上,且
(
).
(Ⅰ)试确定函数
在区间
上的单调性,并证明;
(Ⅱ)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f54cbeea3e211cc40e5de8ef4e22952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f148608f74df038357b72d13db8cd178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d362391d1f4338d84b7961f7f91ad16f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13e0880d14596232bc973395d41f312.png)
(Ⅰ)试确定函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e014c897944a8688e6a008f188947576.png)
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc635ee7c4069fe056cdad99d347971f.png)
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