内容正文:
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知识回顾
知识点一 指数函数的概念
一般地,函数 称为指数函数,其中a为常数
(a>0且a ≠1)
y=ax
底数a为大于0且不等于1的常数;
指数位置为单一自变量x;
ax的系数是1.
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知识点二 指数函数的性质与图像
(0,1)
1
(0,+∞)
增函数
减函数
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问题引入
底数a分类讨论
无
和
无
4.1.2指数函数的性质与图像
主讲人:孙美宁
——复合函数的单调性
1
理解复合函数的概念;
2
能判断复合函数;
能解决简单的复合函数单调性问题.
3
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知识探究一
令
令
概念辨析
下列函数是否为复合函数?
1.
两个或两个以上的函数经过嵌套式复合成的函数。
复合函数:
复合函数形式:
令t=g(x),
则
称
为内层函数,
为外层函数。
√
×
×
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知识探究一
1
2
内函数:
外函数:
分别判断内外函数的单调性;
尝试利用定义法判断复合函数在两区间上的单调性.
函数的定义域
内:
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知识探究
>
>
>
<
<
<
<
<
内:
外:
复合函数:
2
01
知识探究一
3
该结论能否推广到所有复合函数?
减
增
增
增
增
减
减
减
减
增
减
增
复合函数单调性:同增异减
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例1.
求函数 的单调区间。
(3)
(3)分别判断内、外函数的单调性
复合函数单调区间的求解:
(1)确定函数定义域
根据同增异减确定整体单调性
(4)
(2)将 分解为内层函数和外层函数
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变式1.
求函数 的单调区间。
解:
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例2.
小结
同增异减
复合函数
单调性
概
念
确定整体单调性
求
解
确定定义域
分解内
、外函数
判断内外函数单调性
判
断
内层函数
外层函数
两个或两个以上的函数经过嵌套式复合成的函数。
随堂检测
1.判断下列函数是否为复合函数
2.求下列函数的单调区间
×
√
√
√
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拓展提升
解:
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高考链接
布置作业
1.绿色通道:P 9 类型三
2.书后习题:A3
必做题:
选做题:
课时作业2:4、6
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课后探索
感谢观看
a>1
0<a<1
图象
过定点 , 即当x=0时,y=
性质
定义域
R
值域
__________
单调性
在R上是__________
在R上是__________
奇偶性
非奇非偶函数
$