Question

tính nhanh

2/3 x 4/9 + 2/3 x 5/9

 

Answer 1

=\(\dfrac{2}{3}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{2}{3}\times\dfrac{9}{9}=\dfrac{2}{3}\)

Answer 2

\(=\dfrac{2}{3}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)\\ =\dfrac{2}{3}\times1=\dfrac{2}{3}\)

Answer 3

\(=\dfrac{2}{3}\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{2}{3}\)

Answer 4

2/3 ×4/9+2/3×5/9
= 2/3x ( 4/9 + 5/9)
= 2/3 x 
= 2/39/9= 2/3 x 1=2/3

 

  

Answer 5

= \(\dfrac{2}{3}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)\)

\(=\dfrac{2}{3}\times1\)

\(=\dfrac{2}{3}\)

Answer 6

=2/3

Answer 7

\(\dfrac{2}{3}\times\dfrac{4}{9}+\dfrac{2}{3}\times\dfrac{5}{9}\)

\(=\dfrac{2}{3}\times\left(\dfrac{4}{9}+\dfrac{5}{9}\right)\)

\(=\dfrac{2}{3}\times1\)

\(=\dfrac{2}{3}\)