2. 外语
  3. The function f has the property that f(x) = f(x+1) for all numbers x. If f(5) = 7, what is the value of f(9)? ________.

The function f has the property that f(x) = f(x+1) for all numbers x. If f(5) = 7, what is the value of f(9)? ________.

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问题 The function f has the property that f(x) = f(x+1) for all numbers x. If f(5) = 7, what is the value of f(9)? ________.
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答案7
解析 此题考查抽象函数，由已知关系可知，f(9)=f(8)=…=f(5)=7。
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