高一数学对数函数这一块的公式
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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)
(5)
a^(log(b)n)=n^(log(b)a)
证明:
设a=n^x
则a^(log(b)n)=(n^x)^log(b)n=n^(x·log(b)n)=n^log(b)(n^x)=n^(log(b)a)
(5)
对数恒等式:
a^log(a)N=N;
log(a)a^b=b
(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)
(5)
a^(log(b)n)=n^(log(b)a)
证明:
设a=n^x
则a^(log(b)n)=(n^x)^log(b)n=n^(x·log(b)n)=n^log(b)(n^x)=n^(log(b)a)
(5)
对数恒等式:
a^log(a)N=N;
log(a)a^b=b
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