一道对数函数题f(x)=log1/2 [(a+4/3-2ax+3]当定义域属于R时,求a的范围?当值域为R时,求a的范围?在[-1,正无穷）内有意义,求a的范围?值域为（负无穷,1/2],求a的范围?在（负无穷,1/2]上递增,求a的范围?数
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