[tex]media \: aritmetica = \frac{1(6) + 2(3)}{2} = \frac{1 \frac{6}{9} + 2 \frac{3}{9} }{2} = \frac{ \frac{15}{9} + \frac{21}{9} }{2} = \frac{ \frac{36}{9} }{2} = \frac{36}{9} \div \frac{2}{1} = \frac{36}{9} \times \frac{1}{2} = \frac{36}{18} = 2[/tex]
