Ta có:\(\hept{\begin{cases}\left|x-1,5\right|\ge0\\\left|y-2,3\right|\ge0\end{cases}\Rightarrow\left|x-1,5\right|+\left|y-2,3\right|\ge0}\)
Dấu "=" xảy ra khi \(\hept{\begin{cases}\left|x-1,5\right|=0\\\left|y-2,3\right|=0\end{cases}\Rightarrow\hept{\begin{cases}x=1,5\\y=2,3\end{cases}}}\)
b,tương tự