Question

15x1\(\dfrac{2}{5}\)+ \(\dfrac{3}{5}\)x15

Answer 1

\(=15\left(1+\dfrac{2}{5}+\dfrac{3}{5}\right)=15\cdot2=30\)

Answer 2

36 bạn nhé

Answer 3

30

Answer 4

\(15\times1\dfrac{2}{5}+\dfrac{3}{5}\times15=15\times\dfrac{7}{5}+\dfrac{3}{5}\times15\)

                              \(=15\times\left(\dfrac{7}{5}+\dfrac{3}{5}\right)\)

                              \(=15\times2\)

                              \(=30\)