Question

9/7 + 7/13 -( 7/13 + 2/7) = ?

Mong mn giúp em ạ

Answer 1

\(\dfrac{9}{7}+\dfrac{7}{13}-\left(\dfrac{7}{13}+\dfrac{2}{7}\right)\\ =\dfrac{9}{7}+\dfrac{7}{13}-\dfrac{7}{13}-\dfrac{2}{7}\\ =\dfrac{9}{7}-\dfrac{2}{7}\\ =\dfrac{7}{7}=1\)

Answer 2

`9/7 + 7/13 - (7/13 + 2/7)

`=9/7+7/13-7/13-2/7`

`=(9/7-2/7)+(7/13-7/13)`

`=7/7+0`

`=1`