Question

4 phần 9 + 8 phần 10 + 5 phần 9 + 2 phần 10

Answer 1

`4 / 9 + 8 / 10 + 5 / 9 + 2 / 10`

`= ( 4 / 9 + 5 / 9 ) + ( 8 / 10 + 2 / 10 )`

`= 9 / 9 + 10 / 10`

`= 1 + 1 = 2`

Answer 2

\(\dfrac{4}{9}+\dfrac{8}{10}+\dfrac{5}{9}+\dfrac{2}{10}=\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\left(\dfrac{8}{10}+\dfrac{2}{10}\right)=\dfrac{9}{9}+\dfrac{10}{10}=1+1=2\)

Answer 3

4/9 + 8/10 + 5/9 + 2/10

= (4/9 + 5/9) + (8/10 + 2/10)

= 1 + 1

= 2