Question

Tính nhanh:

2/5 x 3 + 2/5 x 6 + 2/5

Answer 1

2/5 x 3 + 2/5 x 6 + 2/5

= 2/5 x (3+6+1)

=2/5 x 10

= 20/5=4

Answer 2

`2/5 xx 3 + 2/5 xx 6 +2/5`

`= 2/5 xx 3 + 2/5 xx 6 +2/5 xx1`

`= 2/5xx(3+6+1)`

`= 2/5 xx 10`

`= 20/5`

`=4`

Answer 3

2/5 x 3+2/5x6+2/5

=2/5x\(\left(3+6\right)\)+2/5

=2/5x9+2/5

=2/5x\(\left(9+1\right)\)

=2/5x10

=4

Answer 4

\(\dfrac{2}{5}\cdot3+\dfrac{2}{5}\cdot6+\dfrac{2}{5}=\dfrac{2}{5}\cdot\left(3+1+6\right)=\dfrac{2}{5}\cdot10=\dfrac{2}{5}\cdot\dfrac{10}{1}=\dfrac{20}{5}\)=4

Kết quả = 4