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2014-08-29T00:41:00-03:00
  \left[\begin{array}{ccc}a1.1&a1.2&a1.3\\a2.1&a2.2&a2.3\\\end{array}\right]

Fórumulas:
{3i+j, se i=j} e {i-2j, se i for diferente de j}

a1.1= 3.1+1=4  =  a1.1=4
a1.2= 1-2.2=-3  =  a1.2=-3
a1.3= 1-2.3=-5  =  a1.3=-5
a2.1= 2-2.1=0   =  a2.1=0 
a2.2= 3.2+2=8  =  a2.2=8
a2.3= 2-2.3=-4  =  a2.3=-4

\left[\begin{array}{ccc}a1.1&a1.2&a1.3\\a2.1&a2.2&a2.3\\\end{array}\right] = \left[\begin{array}{ccc}4&-3&-5\\0&8&-4\\\end{array}\right]
4 5 4