combinations of abs functions

Author:
Kai-Yong Lin
Topic:
Functions, Mathematics
下列各方程式中，請選出有實數解的選項。(f1(x)=|x|+|x-5|, f2(x)=|x|-|x-5|) (1) f1(x)=1 (2) f1(x)=6 (3) f2(x)=1 (4) f2(x)=6 (5) f2(x)=-1

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