解题方法
1 . 设f(x)=log3x.
(1)若
,判断并证明函数y=g(x)的奇偶性;
(2)令
,x∈[3,27],当x取何值时h(x)取得最小值,最小值为多少?
(1)若
![](https://img.xkw.com/dksih/QBM/2017/1/15/1619456419209216/1619456419676160/STEM/b7e4623eba374818a87c9951c27930ab.png)
(2)令
![](https://img.xkw.com/dksih/QBM/2017/1/15/1619456419209216/1619456419676160/STEM/1c5b8f4ab1b44096bcb6091a613a541b.png)
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解题方法
2 . 已知函数
(
)是偶函数,且在区间
上是增函数.
(1)试确定实数
的值;
(2)先判断函数
在区间
上的单调性,并用定义证明你的结论;
(3)关于
的不等式
在
上恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a14d3c31139fb74a36ab922fcec65c6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe86cace140f2c3588ab115837bbfc9e.png)
(1)试确定实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)先判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96977a5415357a1b31b00b91b511f884.png)
(3)关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa72dc48dbf85e8df904188a9c496024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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解题方法
3 . 已知
,且函数f(x)是定义域为R的奇函数,其中a>0,且a≠1.
(1)求k的值;
(2)判断函数f(x)的单调性,并证明你的结论;
(3)若
时,不等式
对任意x∈[1,+∞)均成立,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b49c6f62a653c862de2b4748917916.png)
(1)求k的值;
(2)判断函数f(x)的单调性,并证明你的结论;
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a98186dcca4e3093a3e910b705b087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5051bfd00c05220c1b5a8fdfe3f0082a.png)
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解题方法
4 . 已知
,且
.
(1)求
的解析式;
(2)判断
的奇偶性与单调性(直接写出结论,不需要证明);
(3)对于
,当
时,有
,求
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cef8b818a4cac7d67f7c8c16d593b92.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab87accf1942ab80def96d12ef173163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f146ceaba195a621e47455caf6f4f5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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