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関数f(x)の定義ドメインは[0,1] 関数f(x-k)+f(x+k)が意味 則{0≤x-k≤1 {0≤x+k≤1 ==> {k≤x≤1+k {-k≤x≤1-k ['∵0 k≤x≤1-k 関数の定義範囲は{x|k≤x≤1-k}です。
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