[tex]A= \left[\begin{array}{ccccc}-2.1+3.1&-2.1+3.2&-2.1+3.3&-2.1+3.4&-2.1+3.5\\-2.2+3.1&-2.2+3.2&-2.2+3.3&-2.2+3.4&-2.2+3.5\\-2.3+3.1&-2.3+3.2&-2.3+3.3&-2.3+3.4&-2.3+3.5\end{array}\right] \\
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A= \left[\begin{array}{ccccc}1&4&7&10&13\\-1&2&5&8&11\\-3&0&3&6&9\end{array}\right] [/tex]