因1所以2+log2 3>3于是f(log2 3)=f(1+log2 3)=f(2+log2 3)=(1/2)^(2+log2 3)=(1/2)^2*(1/2)^log2 3=(1/4)*2^log2 (1/3)=(1/4)*(1/3)=1/12
log以2为底3小于三,代入f(x+1),此时x=log以2为底6,代入,fx=6