Question

log(3)15乘以log(5)15等于多少

Answer 1

log(3)15乘以log(5)15

=log3(3*5)*log5(3*5)

=(log3(3)+log3(5))*(log5(3)+log5(5))

=(1+log3(5))*(log5(3)+1)

=1+log3(5)*log5(3)+log3(5)+log5(3)

=1+(ln3/ln5)*(ln5/ln3)+log3(5)+log5(3)

=2+log3(5)+log5(3)