b: 5/6-3/8=11/24
c: 8/7-2/3=24/21-14/21=10/21
d: 5/3-3/5=25/15-9/15=16/15
B) \(\dfrac{5}{6}-\dfrac{3}{8}=\dfrac{40}{48}-\dfrac{18}{48}=\dfrac{22}{48}=\dfrac{11}{24}\)
C) \(\dfrac{8}{7}-\dfrac{2}{3}=\dfrac{24}{21}-\dfrac{14}{21}=\dfrac{10}{21}\)
D) \(\dfrac{5}{3}-\dfrac{3}{5}=\dfrac{25}{15}-\dfrac{9}{15}=\dfrac{16}{15}\)