试题与答案

设函数f(x),g(x)的定义域分别为Df,Dg,且Df,DE.若对于任意x∈D

题型:填空题

题目:

设函数f(x),g(x)的定义域分别为Df,Dg,且Df,DE.若对于任意x∈Df,都有g(x)=f(x),则称函数g(x)为f(x)在Dg上的一个延拓函数.设f(x)=2x(x≤0),g(x)为f(x)在R上的一个延拓函数,且g(x)是偶函数,则g(x)=______.

答案:

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