\(\Large \dfrac{8}{12}\) ; \(\Large \dfrac{9}{12}\) ; \(\Large \dfrac{

• A.

  \(\Large \dfrac{8}{12}\) ; \(\Large \dfrac{9}{12}\) ; \(\Large \dfrac{7}{12}\)

• B.

  \(\Large \dfrac{8}{12}\) ; \(\Large \dfrac{9}{12}\) ; \(\Large \dfrac{13}{12}\)

• C.

  \(\Large \dfrac{8}{12}\) ; \(\Large \dfrac{10}{12}\) ; \(\Large \dfrac{17}{12}\)

• D.

  \(\Large \dfrac{5}{12}\) ; \(\Large \dfrac{9}{12}\) ; \(\Large \dfrac{7}{12}\)

Mẫu số chung nhỏ nhất là 12 ( vì 12 chia hết cho 3, 4 và 12)
\(\Large \dfrac{2}{3}\) = \(\Large \dfrac{2\times4}{3\times9}\) = \(\Large \dfrac{8}{12}\)
\(\Large \dfrac{3}{4}\) = \(\Large \dfrac{3\times3}{4\times3}\) = \(\Large \dfrac{9}{12}\)
Vậy sau khi quy đồng ta được các phân số là: \(\Large \dfrac{8}{12}\) ; \(\Large \dfrac{9}{12}\) ; \(\Large \dfrac{7}{12}\)