Question

giúp mình 4 bài cuối nhé!

Answer 1

Bài `1`

\(\dfrac{14}{28}=\dfrac{14:14}{28:14}=\dfrac{1}{2}\\ \dfrac{25}{50}=\dfrac{25:25}{50:25}=\dfrac{1}{2}\\ \dfrac{48}{30}=\dfrac{48:6}{30:6}=\dfrac{8}{5}\\ \dfrac{81}{54}=\dfrac{81:27}{54:27}=\dfrac{3}{2}\)

Bài `2`

`20/30=(20:10)/(30:10)= 2/3`

`8/12=(8:4)/(12:4)=2/3`

Bài `3`

`25/100=(25:5)/(100:5)=5/20`

Bài `4`

`b,(8xx7xx5)/(11xx8xx7)=5/11`

`c,(19xx2xx5)/(19xx3xx5)=2/3`