a)
[tex]\dfrac{7}{9}+\dfrac{4}{27}=\dfrac{21}{27}+\dfrac{4}{27}=\boxed{\dfrac{25}{27}}[/tex]
b)
[tex]\dfrac{3}{4}-\dfrac{8}{13}=\dfrac{39}{52}-\dfrac{32}{52}=\boxed{\dfrac{7}{52}}[/tex]
c)
[tex]\dfrac{5}{6}+\dfrac{3}{4}-\dfrac{7}{24}=\dfrac{20}{24}+\dfrac{18}{24}-\dfrac{7}{24}=\dfrac{38}{24}-\dfrac{7}{24}=\dfrac{31}{24}=\boxed{1\dfrac{7}{24}}\\[/tex]
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a)
[tex]\dfrac{7}{9}+\dfrac{4}{27}=\dfrac{21}{27}+\dfrac{4}{27}=\boxed{\dfrac{25}{27}}[/tex]
b)
[tex]\dfrac{3}{4}-\dfrac{8}{13}=\dfrac{39}{52}-\dfrac{32}{52}=\boxed{\dfrac{7}{52}}[/tex]
c)
[tex]\dfrac{5}{6}+\dfrac{3}{4}-\dfrac{7}{24}=\dfrac{20}{24}+\dfrac{18}{24}-\dfrac{7}{24}=\dfrac{38}{24}-\dfrac{7}{24}=\dfrac{31}{24}=\boxed{1\dfrac{7}{24}}\\[/tex]