Question

Tính bằng cách thuận tiện:

\(\dfrac{5}{6}\times\dfrac{3}{7}+\dfrac{3}{7}\times\dfrac{7}{6}\)

Answer 1

\(\dfrac{5}{6}\times\dfrac{3}{7}+\dfrac{3}{7}\times\dfrac{7}{6}=\dfrac{3}{7}\times\left(\dfrac{5}{6}+\dfrac{7}{6}\right)\)

\(=\dfrac{3}{7}\times\dfrac{12}{6}=\dfrac{3}{7}\times2=\dfrac{6}{7}\)