Tính: \(\Large \dfrac{45}{63}\) \(\Large \dfrac{55}{63}\) \(\Large \df

Tính:

• A.

  \(\Large \dfrac{45}{63}\)

• B.

  \(\Large \dfrac{55}{63}\)

• C.

  \(\Large \dfrac{63}{55}\)

• D.

  \(\Large \dfrac{5}{63}\)

\(\Large \dfrac{4}{9} + \dfrac{3}{7} = \dfrac{28}{63} + \dfrac{27}{63} = \dfrac{55}{63}\)
Vậy ta chọn phân số \(\Large \dfrac{55}{63}\).