Question

已知f（x）=a的x-½次幂,f（lga）=根号10,则a=?

Answer 1

f（x）=a^(x-½)

f（lga）=a^(lga-1/2)=10^(1/2)

两边对数(lga-1/2)lga=1/2

a=10 a= 1/√10