Question

[Minh Anh]

Tính bằng cách thuận tiện :

2/⁵ x 4/⁷ + 4/⁷ x 3/⁵

Answer 1

[★彡✿ทợท彡★]

\(\dfrac{2}{5}\times\dfrac{4}{7}+\dfrac{4}{7}\times\dfrac{3}{5}=\left(\dfrac{2}{5}+\dfrac{3}{5}\right)\times\dfrac{4}{7}=1\times\dfrac{4}{7}=\dfrac{4}{7}\)