Let G be a non-zero real number set R * for the algebraic system composed of ordinary multiplication, which of the following functions is the endomorphism of G?
A、f(x)=|x|;
B、f(x)=|x|+1;
C、f(x)=0;
D、f(x)=2
发布时间：2025-11-02 18:42:04
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答案：f(x) = |x|
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