Question

tinh nhanh

5/9 x 8/17 + 4/9 x 8/17 

Answer 1

`5/9 xx 8/17 + 4/9 xx 8/17`

` = 8/17 xx ( 5/9 + 4/9)`

`= 8/17 xx 9/9`

` = 8/17 xx 1`

` = 8/17`

Answer 2

\(\dfrac{5}{9}\times\dfrac{8}{17}+\dfrac{4}{9}\times\dfrac{8}{17}=\dfrac{8}{17}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{8}{17}\times\left(\dfrac{5+4}{9}\right)=\dfrac{8}{17}\times\dfrac{9}{9}=\dfrac{8}{17}\times1=\dfrac{8}{17}.\)

Answer 3

= 8/17 x 9 (5/9 + 4/9)

= 8/17 x 1

= 8/17

Answer 4

\(\dfrac{5}{9}\times\dfrac{8}{17}+\dfrac{4}{9}\times\dfrac{8}{17}=\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\times\dfrac{8}{17}=1\times\dfrac{8}{17}=\dfrac{8}{17}\)