\(\left(\dfrac{3}{8}+\dfrac{-3}{4}+\dfrac{7}{12}\right):\dfrac{5}{6}+\dfrac{1}{2}\)
=\(\left(\dfrac{-3}{8}+\dfrac{7}{12}\right):\dfrac{5}{6}+\dfrac{1}{2}\)
=\(\dfrac{5}{24}:\dfrac{5}{6}+\dfrac{1}{2}\)
=\(\dfrac{1}{4}+\dfrac{1}{2}\)
=\(\dfrac{3}{4}\)
(3/8+-3/4+7/12):5/6+1/2
(9/24+-18/24+14/24);5/6+1/2
=5/24:5/6+1/2
=5/24x6/5+1/2
=4+1/2=8/2+1/2=9/2
Ta có: \(\left(\dfrac{3}{8}+\dfrac{-3}{4}+\dfrac{7}{12}\right):\dfrac{5}{6}+\dfrac{1}{2}\)
\(=\left(\dfrac{9}{24}+\dfrac{-18}{24}+\dfrac{14}{24}\right)\cdot\dfrac{6}{5}+\dfrac{1}{2}\)
\(=\dfrac{5}{8}\cdot\dfrac{6}{5}+\dfrac{1}{2}\)
\(=\dfrac{3}{4}+\dfrac{2}{4}=\dfrac{5}{4}\)
