Question

ai giúp em với ạ chứ từ lúc đến h ko ai giúp ạ mong ad xem lại !

Answer 1

\(a, \dfrac{-3}{7}-\left(\dfrac{5}{9}-\dfrac{3}{7}\right) \)
\(=\dfrac{-3}{7}-\dfrac{5}{9}+\dfrac{3}{7}\)
\(=\dfrac{-3}{7}+\dfrac{3}{7}-\dfrac{5}{9}\)
\(=0-\dfrac{5}{9}\)
\(=\dfrac{-5}{9}\)

Answer 2

`a)` 

`-3/7-(5/9-3/7)`

`=-3/7-5/9+3/7`

`=(-3/7+3/7)+(-5/9)`

`=0+(-5/9)=-5/9`

`b)`

`=5/7(2/11+3/11-1(5)/11)`

`=5/(7).(-1)`

`=-5/7`

`@Shả`

Answer 3

\(b,\dfrac{2}{11}.\dfrac{5}{7}+\dfrac{5}{7}.\dfrac{3}{11}-\dfrac{5}{7}.1\dfrac{5}{11}\)
\(=\dfrac{2}{11}.\dfrac{5}{7}+\dfrac{5}{7}.\dfrac{3}{11}-\dfrac{5}{7}.\dfrac{16}{11}\)
\(=\dfrac{5}{7}.\left(\dfrac{2}{11}+\dfrac{3}{11}-\dfrac{16}{11}\right)\)
\(=\dfrac{5}{7}.\left(\dfrac{5}{11}-\dfrac{16}{11}\right)\)
\(=\dfrac{5}{7}.\left(-1\right)\)
\(=\dfrac{-5}{7}\)