Câu trả lời:
\(\dfrac{7}{9}\times\dfrac{2}{3}+\dfrac{3}{4}:\dfrac{2}{5}\)
\(=\dfrac{14}{27}+\dfrac{15}{8}\)
\(=\dfrac{517}{216}\)
\(\dfrac{1}{6}+\dfrac{3}{4}+\dfrac{5}{2}:\dfrac{1}{9}\)
\(=\dfrac{1}{6}+\dfrac{3}{4}+\dfrac{45}{2}\)
\(=\dfrac{281}{12}\)