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∵f(x)的定義域為-1,1,即-1<x<1 ∴f(x+2)的定義域為:-1<x+2<1,即-3<x<-1 f(x+1)的定義域為:-1<x+1<1,即:-2<x<0 ∴f(x+2)+f(x+1)的定義域為:-2<x<-1
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