對數計算怎麼算?
靈活運用公式,如下:
當a>0且a≠1時,M>0,N>0,那麼: (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)log(a^n)(M)=1/nlog(a)(M)(n∈R) (5)換底公式:log(A)M=log(b)M/log(b)A (b>0且b≠1) (6)a^(log(b)n)=n^(log(b)a) 證明: 設a=n^x則a^(log(b)n)=(n^x)^log(b)n=n^(x·log(b)n)=n^log(b)(n^x)=n^(log(b)a) (7)對數恆等式:a^log(a)N=N; log(a)a^b=b (8)由冪的對數的運算性質可得(推導公式)