1) Tìm x:
\(\left|x-1,5\right|+\left|2,5-x\right|=0\)
mà \(\left\{{}\begin{matrix}\left|x-1,5\right|\ge0\\\left|2,5-x\right|\ge0\end{matrix}\right.\forall x\) ; \(\left|x-1,5\right|\ne\left|2,5-x\right|\); \(\left|x-1,5\right|\&\left|2,5-x\right|\ne0\)
\(\Rightarrow x\in\varnothing\)
Vậy \(\Rightarrow x\in\varnothing\)