函数f={cos(3/2)πx(0≤x≤1){log1/3[x](x>1) ,若a,b,c互不相等,且f=f=f,则a+b+c的取值范围是A (4/3,3)B [4/3,3)C (4/3,4)D (7/3,13/3)当0≤x≤1时,f=cos(3/2)πx当x>1时,f=log1/3[x]【1/3是底数,x是真数】

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