\(\dfrac{4}{3}+\dfrac{-11}{31}+\dfrac{3}{10}-\dfrac{20}{31}-\dfrac{2}{5}\)
\(=\dfrac{4}{3}+\left(\dfrac{-11}{31}+\dfrac{-20}{31}\right)+\left(\dfrac{3}{10}-\dfrac{2}{5}\right)\)
\(=\dfrac{4}{3}+-1+\dfrac{-1}{10}\)
\(=\dfrac{1}{3}+\dfrac{-1}{10}\)
\(=\dfrac{7}{30}\)
Chúc bạn học tốt
= 91/93 + -107/310 - 2/5
= 19/30 - 2/5
= 7/30
= 4/3 -11/31 + 3/10 - 20/31 - 2/5
= 4/3 +3/10 - 2/5 +(-11/31 - 20/31)
= 37/30 -1 = 7/30
\(\dfrac{4}{3}+\dfrac{-11}{31}+\dfrac{3}{10}-\dfrac{20}{31}-\dfrac{2}{5}\)
= \(\dfrac{4}{3}+-\dfrac{11}{31}+\dfrac{3}{10}-\dfrac{20}{31}-\dfrac{2}{5}\)
= \(\dfrac{4}{3}-\dfrac{11}{31}+\dfrac{3}{10}-\dfrac{20}{31}-\dfrac{2}{5}\)
= \(1\dfrac{1}{3}+\dfrac{3}{10}-\left(\dfrac{11}{31}+\dfrac{20}{31}\right)-\dfrac{2}{5}\)
= \(1-1+\dfrac{1}{3}+\dfrac{3}{10}-\dfrac{2}{5}\)
= \(0+\dfrac{10}{30}+\dfrac{9}{30}-\dfrac{12}{30}\)
= \(\dfrac{10+9-12}{30}\)
= \(\dfrac{7}{30}\)
