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题目来源：
OG详解-OG9 数学2 Q7
正确答案：1
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The correct answer is 1. It’s given that the function f is defined by f(x) = x+ 811. Substituting 311 for x in the given function yields f (311)=311+811, which gives f(311) = 1111 , or f (311)= 1. Therefore, when x =311, the value of f(x) is 1.
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