Question

Rút gọn các phân số: \(\dfrac{15}{21};\dfrac{20}{35};\dfrac{72}{120}\).

Answer 1

\(\dfrac{15}{21}=\dfrac{15:3}{21:3}=\dfrac{5}{7}\)
\(\dfrac{20}{35}=\dfrac{20:5}{35:5}=\dfrac{4}{7}\)
\(\dfrac{72}{120}=\dfrac{72:24}{120:24}=\dfrac{3}{5}\)