Bài 2 trang 164 (Phép chia) SGK Toán 5

Tính: 

a) \(\dfrac{3}{10} : \dfrac{2}{5}\) ;                              b) \(\dfrac{4}{7} : \dfrac{3}{11}\).

a) \(\dfrac{3}{10} : \dfrac{2}{5} = \dfrac{3}{10} \times \dfrac{5}{2} = \dfrac{15}{20} = \dfrac{3}{4}\) ;

b)  \(\dfrac{4}{7} : \dfrac{3}{11} = \dfrac{4}{7} \times \dfrac{11}{3} = \dfrac{44}{21}\).