1.Trang / the / good / students / our class.

=> Trang is the best students in our class.

1.Trang / the / good / students / our class

=> Trang is the best students in our lass

\(\dfrac{17}{21}\) và \(\dfrac{1717}{2121}\)

Có: \(\dfrac{1717}{2121}\) = \(\dfrac{1717:101}{2121:101}=\dfrac{17}{21}\)

vì \(\dfrac{17}{21}=\dfrac{17}{21}=>\dfrac{17}{21}=\dfrac{1717}{2121} \)

Vậy \(\dfrac{17}{21}=\dfrac{1717}{2121}\)