Sagot :
[tex]A=\left[\begin{array}{ccc}acido\ cloridrico\\hidroxido\ de\ amonia\\sulfato\ de\ aluminio\end{array}\right]\\ \\ B=\left[\begin{array}{cccc}23&10&17&32\\42&13&44&27\\12&15&7&16\end{array}\right]\\ \\ C=\left[\begin{array}{cccc}12&45&3&2\\2&3&4&7\\15&10&17&25\end{array}\right][/tex]
[tex]A\ =\ B\ +\ C\\\\ \\ \left[\begin{array}{ccc}acido\ cloridrico\\hidroxido\ de\ amonia\\sulfato\ de\ aluminio\end{array}\right]\\\\ =\\\\ \left[\begin{array}{cccc}23&10&17&32\\42&13&44&27\\12&15&7&16\end{array}\right]\\\\ +\\\\ \left[\begin{array}{cccc}12&45&3&2 \\2&3&4&7 \\15&10&17&25\end{array}\right][/tex]
[tex]\left[\begin{array}{ccc}acido\ cloridrico\\hidroxido\ de\ amonia\\sulfato\ de\ aluminio\end{array}\right]= \left[\begin{array}{cccc}35&55&20&34\\44&16&48&34\\27&25&24&41\end{array}\right]\\[/tex]