Resposta
a)[tex]\frac{12}{5} +\frac{3}{5} =\frac{12+3}{5} =\frac{15}{5} =\frac{3}{5}[/tex]
b)[tex]\frac{24}{9} -\frac{25}{9}= \frac{24-25}{9}= \frac{1}{9}[/tex]
c)[tex]\frac{2}{3} -\frac{1}{3}= \frac{2-1}{3} =\frac{1}{3}[/tex]
d)[tex]\frac{15}{3} -\frac{10}{3} =\frac{15-10}{3}= \frac{5}{3}[/tex]
