求奇偶性只要求出f(-x)与f(x)对比就好~
由题意
f(-x)=(-x)ln[(-x+1)/(-x-1)]=(-x)ln[(x-1)/(x+1)]
=(-x)ln{[(x+1)/(x-1)]^(-1)}=(-x)(-1)ln[(x+1)/(x-1)]
=xln[(x+1)/(x-1)]
=f(x)
相等所以是偶函数啦
求奇偶性只要求出f(-x)与f(x)对比就好~
由题意
f(-x)=(-x)ln[(-x+1)/(-x-1)]=(-x)ln[(x-1)/(x+1)]
=(-x)ln{[(x+1)/(x-1)]^(-1)}=(-x)(-1)ln[(x+1)/(x-1)]
=xln[(x+1)/(x-1)]
=f(x)
相等所以是偶函数啦