Question

\(\dfrac{4}{5}+\dfrac{2}{7}-\dfrac{7}{10}\)

Answer 1

\(=\dfrac{4.7+2.5}{35}-\dfrac{7}{10}=\dfrac{38}{35}-\dfrac{7}{10}=\dfrac{380-7.35}{350}=\dfrac{380-245}{350}=\dfrac{135}{350}=\dfrac{27}{70}\)

Answer 2

đáp án là \(\dfrac{27}{10}\) bạn bấm máy tình là ra