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【简答题】
函数f（x）的定义域为D，若满足①f（x）在D内是单调函数，②存在[a，b]?D，使f（x）在[a，b]上的值域为[-b，-a]，那么y=f（x）叫做对称函数，现有f（x）= 2-x -k是对称函数，那么k的取值范围是______．
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