Question

Cả nhà ui ,giúp mình vx huhu ,khó qá

Answer 1

Do \(\left\{{}\begin{matrix}\sqrt{12a-\left(b+c\right)^2}\ge0\\\sqrt{12b-\left(a+c\right)^2}\ge0\\\sqrt{12c-\left(a+b\right)^2}\ge0\end{matrix}\right.\) \(\Rightarrow A\ge0\)

\(A_{min}=0\) khi \(\left\{{}\begin{matrix}12a=\left(b+c\right)^2\\12b=\left(a+c\right)^2\\12c=\left(a+b\right)^2\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}a=b=c=0\\a=b=c=3\end{matrix}\right.\)

Answer 2