Odpowiedź :
[tex]\dfrac{9}{15} +\dfrac{4}{15} =\boxed{\dfrac{13}{15} }[/tex]
[tex]\dfrac{7}{11} +\dfrac{2}{11} =\boxed{\dfrac{9}{11} }[/tex]
[tex]4\dfrac{3}{8} +2\dfrac{4}{8} =\boxed{6\dfrac{7}{8} }[/tex]
[tex]\dfrac{9}{15} +\dfrac{4}{15} =\boxed{\dfrac{13}{15} }[/tex]
[tex]\dfrac{7}{11} +\dfrac{2}{11} =\boxed{\dfrac{9}{11} }[/tex]
[tex]4\dfrac{3}{8} +2\dfrac{4}{8} =\boxed{6\dfrac{7}{8} }[/tex]