\(\dfrac{6}{8}\) = \(\dfrac{6:2}{8:2}\) = \(\dfrac{3}{4}\)
\(\dfrac{3}{6}\) = \(\dfrac{3:3}{6:3}\) = \(\dfrac{1}{2}\)
\(\dfrac{8}{16}\) = \(\dfrac{8:8}{16:8}\) = \(\dfrac{1}{2}\)
\(\dfrac{12}{24}\) = \(\dfrac{12:12}{24:12}\) = \(\dfrac{1}{2}\)
\(\dfrac{15}{20}\) = \(\dfrac{15:5}{20:5}\) = \(\dfrac{3}{4}\)
Vậy \(\dfrac{6}{8}\) = \(\dfrac{15}{20}\)
Chọn d. \(\dfrac{15}{20}\)