Question

7/12 - 2/7 + 1/12 =

 

 

giúp tớ làm cách thuận tiện nhất nhá 

 

Answer 1

`=>`Gợi ý:

`7/12 - 2/7 + 1/12`

`= (7/12 + 1/12) - 2/7`

`= 2/3 - 2/7`

`= 8/21`

Answer 2

( 7/12 + 1/12) - 2/7= 2/3 - 2/7 = 8/21

Answer 3

\(\dfrac{7}{12}-\dfrac{2}{7}+\dfrac{1}{12}\)

\(=\left(\dfrac{7}{12}+\dfrac{1}{12}\right)-\dfrac{2}{7}\)

\(=\dfrac{2}{3}-\dfrac{2}{7}\)

\(=\dfrac{14}{21}-\dfrac{6}{21}=\dfrac{14-6}{21}=\dfrac{8}{21}\)