Tính: \(\Large \dfrac{2}{7}\) \(\Large \dfrac{20}{7}\) \(\Large \dfrac

Tính:

• A. \(\Large \dfrac{2}{7}\)
• B. \(\Large \dfrac{20}{7}\)
• C. \(\Large \dfrac{8}{21}\)
• D. \(\Large \dfrac{20}{21}\)

\(\Large \dfrac{4}{3} \times \dfrac{5}{7} = \dfrac{4 \times 5}{3 \times 7} = \dfrac{20}{21}\)
Vậy ta chọn phân số \(\Large \dfrac{20}{21}\).