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高一数学(对数函数和其性质1)
第1课时
湖南省麻阳一中计算机教学课件
对数函数及其性质（一）
2017年4月7日
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指数函数的定义及其性质.
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阅读教材P70 - P71
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1. 对数函数的定义：
一般地, 函数y=logax(a0, 且a≠1)叫做对数函数.
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2.对数函数y=logax(a0且a≠1)的图象和性质：
0a1
a1
图象
定义域
值域
性质
R
R
(0,+∞)
(0,+∞)
(2)在(0,+∞)上是减 函数;
(1)过定点(1, 0)
(3)当x1时, y0; 当0x1时, y0.
(2)在(0,+∞)上是增 函数;
(1)过定点(1, 0)
(3)当x1时, y0; 当0x1时, y0.
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例1：
求下列函数的定义域.
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例2:
比较下列各组数中两个值的大小：
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例3:
Evalua
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