已知函数fm(x)的定义域为实数集R,满足fm(x)={1,x∈M(M是R的非空真子集) 0,x不属于M 0,x不∈M在R上有两个非空真子集A,B,且A∩B=空集,则F(X)=(fA∪B(X)+1)/(fA(x)+fB(x)+1)的值域为什么是{1}
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