a/ \(=\dfrac{17}{8}+\dfrac{5}{4}=\dfrac{17}{8}+\dfrac{10}{8}=\dfrac{27}{8}\)
b/ \(=\dfrac{43}{9}-\dfrac{10}{9}=\dfrac{33}{9}\)
c/ \(\dfrac{4}{5}\times\dfrac{25}{8}=\dfrac{\dfrac{5}{2}}{ }\)
d/ \(=\dfrac{6}{5}:\dfrac{9}{5}=\dfrac{6}{5}.\dfrac{5}{9}=\dfrac{2}{3}\)