1/4是底数么,
那么y=log1/4 (1-x) +log1/4 (x+3)
=log1/4 (1-x)(x+3)
=log1/4(-x²-2x+3)
令f(x)=-x²-2x+3>0,
1-x>0
x+3>0
=》-3