Question

f(x+1)=1/2f(x),则f(x)等于多少?

Answer 1

选D

A.f(x)=1/2(x+1)

f(x+1)=1/2(x+2)

B.f(x)=x+1/4

f(x+1)=x+5/4

C.f(x)=2^x

f(x+1)=2^(x+1)=2f(x)

D.f(x)=2^-x

f(x+1)=2^-(x+1)=1/2f(x)