解f(1/9)=f(1/3*1/3)=2f(1/3）=2f(3*1/9）=2[f(3）+f(1/9)]=2f(3）+2f(1/9)f(9)=f(3*3）=2f(3）f(1/9)=f(9)+2f(1/9)f(9)=-f(1/9)所以f(1/9)/f(9)=-1 希望能帮助你，数学辅导团为您解答，不理解请追问，理解请及时采纳！(*^__^*)
