高一函数题,在线中~~~~~~~~~~~~~~~~~~~~~

来源:百度知道 编辑:UC知道 时间:2024/07/02 08:42:26
已知f(x)满足f(-x)=-f(x),且f(x+3)=f(x),x∈(0,1)时,f(x)=3^x-1求f[log(1/3)36]值.
写下过程
不对啊?不是这个答案,能再算算吗?

f[log(1/3)36]
[f(x+3)=f(x)]
=f[log(1/3)36+3]
=f[log(1/3)36+log(1/3)(1/27)]
=f[log(1/3)(4/3)]
[f(-x)=-f(x)]
=-f[-log(1/3)(4/3)]
=-f[log(3)(4/3)]
[0=log3(1)<=log(3)(4/3)<log(3)3=1]
=-3^(log(3)(4/3))+1
=-(4/3)^log(3)3+1
=-4/3+1
=-1/3

我以为是2^(x-1)了

f[log(1/3)36] =f[-log(3)36] =f[3-log(3)36]
=f[log(3)27/36] =f[log(3)3/4]
-1<[log(3)3/4]<0
f(x)=-f(-x)
f[log(3)3/4]=-f[log(3)4/3]=-{3^[log(3)4/3]-1}=-1/3