Ta có :
\(\left\{{}\begin{matrix}\left(x+1,5\right)^8\ge0\\\left(2,7-y\right)^{12}\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left(x+1,5\right)^8+\left(2,7-y\right)^{12}\ge0\)
Mà \(\left(x+1,5\right)^8+\left(2,7-y\right)^{12}=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}\left(x+1,5\right)^8=0\\\left(2,7-y\right)^{12}=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=-1,5\\y=2,7\end{matrix}\right.\)
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