:)) ko có danh hiệu lạc loài qué 

nick iem 

a) \(\dfrac{1}{2}\times\dfrac{3}{4}+\dfrac{1}{2}=\dfrac{3}{8}+\dfrac{1}{2}=\dfrac{3}{8}+\dfrac{4}{8}=\dfrac{7}{8}\)

b) \(\dfrac{3}{4}:\dfrac{2}{3}-\dfrac{1}{6}=\dfrac{3}{4}\times\dfrac{3}{2}-\dfrac{1}{6}=\dfrac{9}{8}-\dfrac{1}{6}=\dfrac{27}{24}-\dfrac{4}{24}=\dfrac{23}{24}\)