a)\(\dfrac{5}{6}+\dfrac{1}{2}=\dfrac{5}{6}+\dfrac{3}{2}=\dfrac{8}{8}=1\)
b)\(\dfrac{11}{3}-\dfrac{2}{5}=\dfrac{55}{15}-\dfrac{6}{15}=\dfrac{49}{15}\)
c)\(\dfrac{3}{4}\times\dfrac{2}{9}=\dfrac{3\times2}{4\times9}=\dfrac{6}{36}=\dfrac{1}{6}\)
d)\(\dfrac{2}{1}:\dfrac{4}{7}=\dfrac{2}{1}\times\dfrac{7}{4}=\dfrac{14}{4}=\dfrac{7}{2}\)
a) 5/6+1/2=5/6+3/6=8/6=4/3
b) 11/3-2/5= 55/15-6/15=49/15
c) 3/4x2/9=6
d) 2:4/7=2/1x7/4=14/4