【资料图】
1、(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)换底公式:log(A)M=log(b)M/log(b)A (b>0且b≠1) (6)log(a^n)M^m=(m/n)log(a)M (7)对数恒等式:a^log(a)N=N; log(a)a^b=b。
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