$+$ | $+$ | = | $909$ | |||
$+$ | $+$ | = | $516$ | |||
$+$ | $+$ | = | $921$ |
$+$ | $+$ | = | $\text{?}$ |
${x}_{1}=$ | ${x}_{2}=$ | ${x}_{3}=$ |
$\begin{array}{ccc}\multicolumn{1}{c}{\left(\begin{array}{ccc}\hfill 1& \hfill 0& \hfill 2\\ \hfill 2& \hfill 0& \hfill 1\\ \hfill 0& \hfill 1& \hfill 2\end{array}\right)\xb7\left(\begin{array}{c}\hfill {x}_{1}\\ \hfill {x}_{2}\\ \hfill {x}_{3}\end{array}\right)}& =\hfill & \left(\begin{array}{c}\hfill 909\\ \hfill 516\\ \hfill 921\end{array}\right)\hfill \end{array}$ |
${x}_{1}=41,\hspace{0.5em}{x}_{2}=53,\hspace{0.5em}{x}_{3}=434.$ |
$+$ | $+$ | $=$ | ||||
${x}_{1}$ | $+$ | ${x}_{2}$ | $+$ | ${x}_{3}$ | $=$ | |
$41$ | $+$ | $53$ | $+$ | $434$ | $=$ | $528$. |