f(x)=log(a)(1+x)/(1-x)
(1)å®ä¹åï¼çæ°>0
(1+x)/(1-x)>0
(x+1)(x-1)<0
-1<x<1
(2)log(a)1â¡0
f(x)=log(a)x 0<a<1,åè°éåï¼a>1,åè°éå¢
â´0<a<1ï¼f(x)=(1+x)/(1-x)<0=f(1)â(1+x)/(1-x)<1â-1<x<0
a>1,f(x)=(1+x)/(1-x)>0=f(1)â(1+x)/(1-x)>1â0<x<1
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