Question

Quy đồng mẫu số rồi so sánh hai phân số:

a) \(\dfrac{2}{5}\) và \(\dfrac{3}{10}\)                     b) \(\dfrac{7}{12}\) và \(\dfrac{5}{6}\)                    c) \(\dfrac{3}{4}\) và \(\dfrac{1}{2}\)                     d) \(\dfrac{8}{3}\) và \(\dfrac{11}{21}\)

Answer 1

a) \(\dfrac{2}{5}=\dfrac{4}{10}\)

\(\dfrac{4}{10}>\dfrac{3}{10}\)

b) \(\dfrac{5}{6}=\dfrac{10}{12}\)

\(\dfrac{7}{12}< \dfrac{10}{12}\)

c) \(\dfrac{1}{2}=\dfrac{2}{4}\)

\(\dfrac{3}{4}< \dfrac{2}{4}\)

d) \(\dfrac{8}{3}=\dfrac{56}{21}\)

\(\dfrac{56}{21}>\dfrac{11}{21}\)