Question

Bài 5: Quy đồng mẫu số các phân số:

\(\dfrac{2}{5}\) và \(\dfrac{5}{7}\)

Answer 1

\(\dfrac{2\times7}{5\times7}=\dfrac{14}{35};\dfrac{5\times5}{7\times5}=\dfrac{25}{35}\)

Answer 2

2/5 và 5/7 

\(\dfrac{2}{5}=\dfrac{2\times7}{5\times7}=\dfrac{14}{35}\)

\(\dfrac{5}{7}=\dfrac{5\times5}{7\times5}=\dfrac{25}{35}\)

Answer 3

\(\dfrac{2}{5}=\dfrac{2x7}{5x7}=\dfrac{14}{35}\\ \dfrac{5}{7}=\dfrac{5x5}{7x5}=\dfrac{25}{35}\)