已知f（x)的值域为［３／８，４／９］则g( x )=f(x)+根号１－２f(x)的值域

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g( x )=f(x)+根号１－２f(x)所以１－２f(x)=0,所以f(x)<=1/2因为f（x)的值域为［３／８，４／９］，所以3/8<=f(x)<=1/2,代入求得1/2<=g(x)<=7/8