Đáp án:
\[\left\{ \begin{array}{l}
{m_{thiec}} = 438\left( g \right)\\
{m_{chi}} = 226\left( g \right)
\end{array} \right.\]
Giải thích các bước giải:
ta có:
\[\begin{array}{l}
{V_{thiec}} + {V_{chi}} = {V_{hopkim}} = \frac{m}{D} = \frac{{664}}{{8,3}} = 80\left( {c{m^3}} \right)\left( 1 \right)\\
{D_{thiec}} = 7300kg/{m^3} = 7,3g/c{m^3}\\
{D_{chi}} = 11300kg/{m^3} = 11,3g/c{m^3}\\
{m_{thiec}} + {m_{chi}} = m\\
\Rightarrow {D_{thiec}}.{V_{thiec}} + {D_{chi}}{V_{chi}} = m\\
\Rightarrow 7,3{V_{thiec}} + 11,3{V_{chi}} = 664\left( 2 \right)\\
\left( 1 \right)\left( 2 \right):\left\{ \begin{array}{l}
{V_{thiec}} = 60\\
{V_{chi}} = 20
\end{array} \right. \Rightarrow \left\{ \begin{array}{l}
{m_{thiec}} = 60.7,3 = 438\left( g \right)\\
{m_{chi}} = 20.11,3 = 226\left( g \right)
\end{array} \right.\\
\end{array}\]
