Bài 1: Tính
a) ( \(\dfrac{-3}{4}\)+ \(\dfrac{2}{5}\)) : \(\dfrac{3}{7}\)+ ( \(\dfrac{3}{5}\) + \(\dfrac{-9}{4}\)) :\(\dfrac{3}{7}\)
b) \(\dfrac{7}{8}\): ( \(\dfrac{2}{9}\)- \(\dfrac{1}{18}\)) + \(\dfrac{7}{8}\) : ( \(\dfrac{1}{36}\) - \(\dfrac{5}{12}\))
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