Question

tính nhanh

3/7 x 1/9 + 3/7 x 8/9

Answer 1

`3/7 xx 1/9 + 3/7 xx 8/9`

`= 3/7 xx (1/9 +8/9)`

`= 3/7 xx 9/9`

`= 3/7 xx 1`

`=3/7`

Answer 2

\(\dfrac{3}{7}\times\dfrac{1}{9}+\dfrac{3}{7}\times\dfrac{8}{9}\)

\(=\dfrac{3}{7}\times\left(\dfrac{1}{9}+\dfrac{8}{9}\right)\)

\(=\dfrac{3}{7}\times1\)

\(=\dfrac{3}{7}\)

Answer 3

`3/7xx1/9+3/7xx8/9`

`=3/7xx(1/9+8/9)`

`=3/7xx9/9`

`=3/7xx1`

`=3/7`