\(\left|a\right|=2\Leftrightarrow\left[{}\begin{matrix}a=2\\a=-2\end{matrix}\right.;\left|b\right|=3\Leftrightarrow\left[{}\begin{matrix}b=3\\b=-3\end{matrix}\right.;\left|c\right|=4\Leftrightarrow\left[{}\begin{matrix}c=4\\c=-4\end{matrix}\right.\)
Mà \(a>b>c\Leftrightarrow\left(a;b;c\right)\in\left\{\left(-2;-3;-4\right);\left(2;-3;-4\right)\right\}\)
\(\Leftrightarrow\left[{}\begin{matrix}a+b-c=-2-3+4=-1\\a+b-c=2-3+4=3\end{matrix}\right.\)
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