Question

Answer 1

`9/7-(3/7-1/2)`

`=9/7-3/7+1/2`

`=(9/7-3/7)+1/2`

`=((9-3)/7) + 1/2`

`=6/7+1/2`

`=12/14+7/14`

`=(12+7)/14`

`=19/14`

Answer 2

\(=\dfrac{9}{7}-\left(\dfrac{3.2-7}{7.2}\right)=\dfrac{9}{7}-\dfrac{6-7}{14}=\dfrac{9.2-\left(-1\right)}{7.2}=\dfrac{18-\left(-1\right)}{14}=\dfrac{19}{14}\)

Answer 3

\(\dfrac{9}{7}-\left(\dfrac{3}{7}-\dfrac{1}{2}\right)=\dfrac{9}{7}-\left(\dfrac{6}{14}-\dfrac{7}{14}\right)=\dfrac{9}{7}-\dfrac{-1}{14}=\dfrac{18}{14}-\dfrac{-1}{14}=\dfrac{19}{14}\)

Answer 4

\(\dfrac{9}{7}\)-\(\left(\dfrac{3}{7}-\dfrac{1}{2}\right)\)

=\(\dfrac{9}{7}-\dfrac{3}{7}+\dfrac{1}{2}\)

=\(\left(\dfrac{9}{7}-\dfrac{3}{7}\right)-\dfrac{1}{2}\)

=\(\dfrac{6}{7}-\dfrac{1}{2}\)

=\(\dfrac{12}{14}-\dfrac{7}{14}\)

=\(\dfrac{5}{14}\)

Answer 5

à mình nhầm

chỗ \(\dfrac{1}{2}\) là (+) mà mình trừ 

nên kết quả chính xác là :\(\dfrac{19}{14}\) nha

sorry