\(=\dfrac{1}{2}-\dfrac{5}{8}\times\dfrac{4}{3}=\dfrac{1}{2}-\dfrac{5}{6}=\dfrac{3-5}{6}=\dfrac{-2}{6}\)
lớp 5 có học số âm hẻ .-.?
\(=\dfrac{1}{2}-\dfrac{5}{6}=\dfrac{3}{6}-\dfrac{5}{6}=-\dfrac{2}{6}\)
\(\dfrac{1}{2}-\dfrac{5}{8}:\dfrac{3}{4}=\dfrac{1}{2}-\dfrac{5}{8}\times\dfrac{4}{3}=\dfrac{1}{2}-\dfrac{1}{24}=\dfrac{12}{24}-\dfrac{20}{24}=\dfrac{-8}{24}=-\dfrac{1}{3}\)