Question

[Phạm Bảo Hân]

3/5.7/9+3/5.2/9+3/5

Answer 1

[Bùi Mạnh Hải]

   \(\dfrac{3}{5}\).\(\dfrac{7}{9}\) + \(\dfrac{3}{5}\).\(\dfrac{2}{9}\) + \(\dfrac{3}{5}\)

= \(\dfrac{3}{5}\).(\(\dfrac{7}{9}\)+ \(\dfrac{2}{9}\)+1)

= \(\dfrac{3}{5}\).(1+1)

= \(\dfrac{6}{5}\)

Answer 2

[Hquynh]

\(\dfrac{3}{5}\times\dfrac{7}{9}+\dfrac{3}{5}\times\dfrac{2}{9}+\dfrac{3}{5}=\dfrac{3}{5}\left(\dfrac{7}{9}+\dfrac{2}{9}+1\right)=\dfrac{3}{5}\times\left(\dfrac{9}{9}+1\right)=\dfrac{3}{5}\times\left(1+1\right)=\dfrac{3}{5}\times2=\dfrac{6}{5}\)