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题目(2011年山东省高考数学模拟第12题):设函数f(x)的定义域为D,若f(x)满足下面两个条件,则称f(x)为闭函数:①f(x)在D内为单调
(2011 Shandong Province entrance math simulation problem 12): Let f (x) define the domain as D, if f (x) satisfies the following two conditions, then f (x) is closed function: ① f D is monotonous