Câu trả lời:

5 : \(\dfrac{3}{4}\) - 4= 5.\(\dfrac{4}{3}\) - 4= \(\dfrac{20}{3}\) - 4=\(\dfrac{8}{3}\)    ; \(\dfrac{4}{5}\) : \(\dfrac{3}{4}\)=\(\dfrac{4}{5}\) . \(\dfrac{4}{3}\) =\(\dfrac{16}{15}\)