Question

求下面各式的值(对数函数)(1)log5的25次方(2)lg1000(3)log15的15次方(4)log9的81次方(

Answer 1

(1) ∵5^2=25∴log(5,25)=2

(2) ∵10^3=1000∴lg1000=3

(3)∵15^1=15∴log(15,15)=1

(4)∵9^2=81∴log(9,81)=2

(5)∵7^3=343∴log(7,343)=3