推荐回答(4个)
定义:
若a^n=b(a>0且a≠1)
则n=log(a)(b)
基本性质:
1、a^(log(a)(b))=b
2、log(a)(a^b)=b
3、log(a)(MN)=log(a)(M)+log(a)(N);
4、log(a)(M÷N)=log(a)(M)-log(a)(N);
5、log(a)(M^n)=nlog(a)(M)
6、log(a^n)M=1/nlog(a)(M)
推导
1、因为n=log(a)(b),代入则a^n=b,即a^(log(a)(b))=b。
2、因为a^b=a^b
令t=a^b
所以a^b=t,b=log(a)(t)=log(a)(a^b)
3、MN=M×N
由基本性质1(换掉M和N)
a^[log(a)(MN)]
=
a^[log(a)(M)]×a^[log(a)(N)]
=(M)*(N)
由指数的性质
a^[log(a)(MN)]
=
a^{[log(a)(M)]
+
[log(a)(N)]}
两种方法只是性质不同,采用方法依实际情况而定
又因为指数函数是单调函数,所以
log(a)(MN)
=
log(a)(M)
+
log(a)(N)
4、与(3)类似处理
MN=M÷N
由基本性质1(换掉M和N)
a^[log(a)(M÷N)]
=
a^[log(a)(M)]÷a^[log(a)(N)]
由指数的性质
a^[log(a)(M÷N)]
=
a^{[log(a)(M)]
-
[log(a)(N)]}
又因为指数函数是单调函数,所以
log(a)(M÷N)
=
log(a)(M)
-
log(a)(N)
5、与(3)类似处理
M^n=M^n
由基本性质1(换掉M)
a^[log(a)(M^n)]
=
{a^[log(a)(M)]}^n
由指数的性质
a^[log(a)(M^n)]
=
a^{[log(a)(M)]*n}
又因为指数函数是单调函数,所以
log(a)(M^n)=nlog(a)(M)
基本性质4推广
log(a^n)(b^m)=m/n*[log(a)(b)]
推导如下:
由换底公式(换底公式见下面)[lnx是log(e)(x),e称作自然对数的底]
log(a^n)(b^m)=ln(b^m)÷ln(a^n)
换底公式的推导:
设e^x=b^m,e^y=a^n
则log(a^n)(b^m)=log(e^y)(e^x)=x/y
x=ln(b^m),y=ln(a^n)
得:log(a^n)(b^m)=ln(b^m)÷ln(a^n)
由基本性质4可得
log(a^n)(b^m)
=
[m×ln(b)]÷[n×ln(a)]
=
(m÷n)×{[ln(b)]÷[ln(a)]}
再由换底公式
log(a^n)(b^m)=m÷n×[log(a)(b)]
--------------------------------------------(性质及推导
完)
[编辑本段]函数图象 1.对数函数的图象都过(1,0)点.
2.对于y=log(a)(n)函数,
①,当0的增大,图象逐渐以(1,0)点为轴顺时针转动,但不超过X=1.
②当a>1时,图象上显示函数为(0,+∞)单增,随着a的增大,图象逐渐以(1.0)点为轴逆时针转动,但不超过X=1.
3.与其他函数与反函数之间图象关系相同,对数函数和指数函数的图象关于直线y=x对称.
[编辑本段]其他性质 性质一:换底公式
log(a)(N)=log(b)(N)÷log(b)(a)
推导如下:
N
=
a^[log(a)(N)]
a
=
b^[log(b)(a)]
综合两式可得
N
=
{b^[log(b)(a)]}^[log(a)(N)]
=
b^{[log(a)(N)]*[log(b)(a)]}
又因为N=b^[log(b)(N)]
所以
b^[log(b)(N)]
=
b^{[log(a)(N)]*[log(b)(a)]}
所以
log(b)(N)
=
[log(a)(N)]*[log(b)(a)]
{这步不明白或有疑问看上面的}
所以log(a)(N)=log(b)(N)
/
log(b)(a)
公式二:log(a)(b)=1/log(b)(a)
证明如下:
由换底公式
log(a)(b)=log(b)(b)/log(b)(a)
----取以b为底的对数
log(b)(b)=1
=1/log(b)(a)
还可变形得:
log(a)(b)×log(b)(a)=1
在实用上,常采用以10为底的对数,并将对数记号简写为lgb,称为常用对数,它适用于求十进伯制整数或小数的对数。例如lg10=1,lg100=lg102=2,lg4000=lg(103×4)=3+lg4,可见只要对某一范围的数编制出对数表,便可利用来计算其他十进制数的对数的近似值。在数学理论上一般都用以无理数e=2.7182818……为底的对数,并将记号
loge。简写为ln,称为自然对数,因为自然对数函数的导数表达式特别简洁,所以显出了它比其他对数在理论上的优越性。历史上,数学工作者们编制了多种不同精确度的常用对数表和自然对数表。但随着电子技术的发展,这些数表已逐渐被现代的电子计算工具所取代。
一般地,如果a(a大于0,且a不等于1)的b次幂等于N,那么数b叫做以a为底N的对数,记作log(a)(N)=b,其中a叫做对数的底数,N叫做真数。
底数则要大于0且不为1
对数的运算性质:
当a>0且a≠1时,M>0,N>0,那么:
(1)log(a)(MN)=log(a)(M)+log(a)(N);
(2)log(a)(M/N)=log(a)(M)-log(a)(N);
(3)log(a)(M^n)=nlog(a)(M) (n∈R)
(4)换底公式:log(A)M=log(b)M/log(b)A (b>0且b≠1)
对数与指数之间的关系
当a>0且a≠1时,a^x=N x=㏒(a)N
对数函数的常用简略表达方式:
(1)log(a)(b)=log(a)(b)
(2)常用对数:lg(b)=log(10)(b)
(3)自然对数:ln(b)=log(e)(b)
e=2.718281828... 通常情况下只取e=2.71828 对数函数的定义
对数函数的一般形式为 y=㏒(a)x,它实际上就是指数函数的反函数(图象关于直线y=x对称的两函数互为反函数),可表示为x=a^y。因此指数函数里对于a的规定(a>0且a≠1),同样适用于对数函数。
右图给出对于不同大小a所表示的函数图形:
可以看到对数函数的图形只不过的指数函数的图形的关于直线y=x的对称图形,因为它们互为反函数。
[编辑本段]性质
定义域:(0,+∞)值域:实数集R
定点:函数图像恒过定点(1,0)。
单调性:a>1时,在定义域上为单调增函数,并且上凸;
0 奇偶性:非奇非偶函数
周期性:不是周期函数
零点:x=1
定义:
若a^n=b(a>0且a≠1)
则n=log(a)(b)
基本性质:
1、a^(log(a)(b))=b
2、log(a)(a^b)=b
3、log(a)(MN)=log(a)(M)+log(a)(N);
4、log(a)(M÷N)=log(a)(M)-log(a)(N);
5、log(a)(M^n)=nlog(a)(M)
6、log(a^n)M=1/nlog(a)(M)
推导
1、因为n=log(a)(b),代入则a^n=b,即a^(log(a)(b))=b。
2、因为a^b=a^b
令t=a^b
所以a^b=t,b=log(a)(t)=log(a)(a^b)
3、MN=M×N
由基本性质1(换掉M和N)
a^[log(a)(MN)] = a^[log(a)(M)]×a^[log(a)(N)] =(M)*(N)
由指数的性质
a^[log(a)(MN)] = a^{[log(a)(M)] + [log(a)(N)]}
两种方法只是性质不同,采用方法依实际情况而定
又因为指数函数是单调函数,所以
log(a)(MN) = log(a)(M) + log(a)(N)
4、与(3)类似处理
MN=M÷N
由基本性质1(换掉M和N)
a^[log(a)(M÷N)] = a^[log(a)(M)]÷a^[log(a)(N)]
由指数的性质
a^[log(a)(M÷N)] = a^{[log(a)(M)] - [log(a)(N)]}
又因为指数函数是单调函数,所以
log(a)(M÷N) = log(a)(M) - log(a)(N)
5、与(3)类似处理
M^n=M^n
由基本性质1(换掉M)
a^[log(a)(M^n)] = {a^[log(a)(M)]}^n
由指数的性质
a^[log(a)(M^n)] = a^{[log(a)(M)]*n}
又因为指数函数是单调函数,所以
log(a)(M^n)=nlog(a)(M)
基本性质4推广
log(a^n)(b^m)=m/n*[log(a)(b)]
推导如下:
由换底公式(换底公式见下面)[lnx是log(e)(x),e称作自然对数的底]
log(a^n)(b^m)=ln(b^m)÷ln(a^n)
换底公式的推导:
设e^x=b^m,e^y=a^n
则log(a^n)(b^m)=log(e^y)(e^x)=x/y
x=ln(b^m),y=ln(a^n)
得:log(a^n)(b^m)=ln(b^m)÷ln(a^n)
由基本性质4可得
log(a^n)(b^m) = [m×ln(b)]÷[n×ln(a)] = (m÷n)×{[ln(b)]÷[ln(a)]}
再由换底公式
log(a^n)(b^m)=m÷n×[log(a)(b)] --------------------------------------------(性质及推导 完) [编辑本段]函数图象 1.对数函数的图象都过(1,0)点.
2.对于y=log(a)(n)函数,
①,当0 ②当a>1时,图象上显示函数为(0,+∞)单增,随着a的增大,图象逐渐以(1.0)点为轴逆时针转动,但不超过X=1.
3.与其他函数与反函数之间图象关系相同,对数函数和指数函数的图象关于直线y=x对称. [编辑本段]其他性质 性质一:换底公式
log(a)(N)=log(b)(N)÷log(b)(a)
推导如下:
N = a^[log(a)(N)]
a = b^[log(b)(a)]
综合两式可得
N = {b^[log(b)(a)]}^[log(a)(N)] = b^{[log(a)(N)]*[log(b)(a)]}
又因为N=b^[log(b)(N)]
所以 b^[log(b)(N)] = b^{[log(a)(N)]*[log(b)(a)]}
所以 log(b)(N) = [log(a)(N)]*[log(b)(a)] {这步不明白或有疑问看上面的}
所以log(a)(N)=log(b)(N) / log(b)(a)
公式二:log(a)(b)=1/log(b)(a)
证明如下:
由换底公式 log(a)(b)=log(b)(b)/log(b)(a) ----取以b为底的对数
log(b)(b)=1 =1/log(b)(a) 还可变形得: log(a)(b)×log(b)(a)=1
在实用上,常采用以10为底的对数,并将对数记号简写为lgb,称为常用对数,它适用于求十进伯制整数或小数的对数。例如lg10=1,lg100=lg102=2,lg4000=lg(103×4)=3+lg4,可见只要对某一范围的数编制出对数表,便可利用来计算其他十进制数的对数的近似值。在数学理论上一般都用以无理数e=2.7182818……为底的对数,并将记号 loge。简写为ln,称为自然对数,因为自然对数函数的导数表达式特别简洁,所以显出了它比其他对数在理论上的优越性。历史上,数学工作者们编制了多种不同精确度的常用对数表和自然对数表。但随着电子技术的发展,这些数表已逐渐被现代的电子计算工具所取代。
1.lg就是以10为底数. 比如:Lg100=Log10 (100) =2
2.log是对数符号,且底数是未知的,用log a(b)表示以a为底b的对数.
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