对数函数的运算(有关对数函数的所有公式)

(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