\(\dfrac{9}{7}-\dfrac{2}{5}:\dfrac{1}{2}\)
\(=\dfrac{9}{7}-\dfrac{2}{5}\times\dfrac{2}{1}\)
\(=\dfrac{9}{7}-\dfrac{4}{5}\)
\(=\dfrac{45}{35}-\dfrac{28}{35}\)
\(=\dfrac{17}{35}\)
\(=\dfrac{9}{7}-\dfrac{2}{5}\times2=\dfrac{9}{7}-\dfrac{4}{5}=\dfrac{45}{35}-\dfrac{28}{35}=\dfrac{17}{35}\)