Question

 

( phải quy đồng ra )

Answer 1

`24-2/5-5/12`

`= 1440/60 - 24/60 - 25/60`

`= (1440-24-25)/60`

`=1391/60`

Answer 2

=1440/60-24/60-25/60

=1391/60

Answer 3

\(24-\dfrac{2}{5}-\dfrac{5}{12}\)

\(=\dfrac{24}{1}-\dfrac{2}{5}-\dfrac{5}{12}\)

\(=\dfrac{120}{5}-\dfrac{2}{5}-\dfrac{5}{12}\)

\(=\dfrac{118}{5}-\dfrac{5}{12}\)

\(=\dfrac{1416}{60}-\dfrac{25}{60}\)

\(=\dfrac{1391}{60}\)