Question

bài 1: Thực hiện phép tính:  

3/5 + 2/5 . 15/18    

Answer 1

\(=\dfrac{3}{5}+\dfrac{2}{5}\cdot\dfrac{5}{6}=\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{9}{15}+\dfrac{5}{15}=\dfrac{14}{15}\)

Answer 2

\(\dfrac{3}{5}+\dfrac{2}{5}.\dfrac{15}{18}=\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{9}{15}+\dfrac{5}{15}=\dfrac{14}{15}\)

Answer 3

\(\dfrac{3}{5}+\dfrac{1}{3}=\dfrac{14}{15}\)

Answer 4

\(\dfrac{3}{5}+\dfrac{2}{5}\times\dfrac{15}{18}=\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\times\dfrac{15}{18}=1\times\dfrac{15}{18}=\dfrac{15}{18}=\dfrac{5}{6}\)