[tex]a) \frac{8}{9} + \frac{2}{9} \\ \ \: \: \: \: \: \: \frac{8 + 2}{ 9} \: \\ \: \: \: \: \: \: \: \: \: \: \: = \frac{10}{9} \\ \\ b) \: \: \frac{4}{9} - \frac{3}{9} \\ \: \: \: \: \: \: \: \: \frac{4 - 3}{9} \\ \: \: \: \: \: \: = \frac{1}{9} \\ \\ c) \: \frac{15}{12} + \frac{4}{12} \\ \: \: \: \: \frac{5 + 4}{12} \\ \: \: \: \: \: \: \: = \frac{9}{12} [/tex]
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[tex]a) \frac{8}{9} + \frac{2}{9} \\ \ \: \: \: \: \: \: \frac{8 + 2}{ 9} \: \\ \: \: \: \: \: \: \: \: \: \: \: = \frac{10}{9} \\ \\ b) \: \: \frac{4}{9} - \frac{3}{9} \\ \: \: \: \: \: \: \: \: \frac{4 - 3}{9} \\ \: \: \: \: \: \: = \frac{1}{9} \\ \\ c) \: \frac{15}{12} + \frac{4}{12} \\ \: \: \: \: \frac{5 + 4}{12} \\ \: \: \: \: \: \: \: = \frac{9}{12} [/tex]
espero que de ayude