[tex]\bold{a)} \ 3,(6) + 1,2(13) = 3\frac{6}{9} + 1 \frac{213 \ - \ 2}{990} = 3 \frac{6}{9} + 1 \frac{211}{990} = \frac{3630}{990} + \frac{1201}{990} = \frac{4831}{990} = \boxed{4 \frac{871}{990}}[/tex]
[tex]\bold{b)} \ 2,(5) + 0,(31) = 2\frac{5}{9} + \frac{31}{99} = \frac{253}{99} + \frac{31}{99} = \frac{284}{99} = \boxed{2 \frac{86}{99}}[/tex]
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