f(x)loga(1-x)+loga(x+3) (0

问题描述:

f(x)loga(1-x)+loga(x+3) (0

f(x)=loga[(1-x)(x+3)]=0=loga(1)
则(1-x)(x+3)=1
-x^2-2x+3=1
x^2+2x-2=0
由定义域,1-x>0,x+3>0
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