f(x^5)=lgx .则f(2)等于?
问题描述:
f(x^5)=lgx .则f(2)等于?
答
x^5=2, x=2^(1/5)
f(2)=((2^(1/5))^5)=lg(2^(1/5))=lg2/5
答
1/5lg2