Question

[2 Nguyễn Thị Quỳnh Anh]

bài 1 tính

\(\dfrac{18}{17}\) - \(\dfrac{5}{9}\)               b,\(\dfrac{1}{2}\) : \(\dfrac{2}{5}\)                c,\(\dfrac{5}{6}\) x 4              d,\(\dfrac{7}{15}\) + \(\dfrac{4}{5}\)

\(\dfrac{2}{5}\) + \(\dfrac{3}{2}\)                 f,\(\dfrac{7}{8}\) - \(\dfrac{2}{3}\)                 g,\(\dfrac{4}{7}\) x 2              h,\(\dfrac{9}{5}\) :\(\dfrac{1}{6}\)

Answer 1

[Lê Minh Vũ]

\(\dfrac{18}{17}-\dfrac{5}{9}=\dfrac{162}{153}-\dfrac{85}{153}=\dfrac{77}{153}\)

\(\dfrac{2}{5}+\dfrac{3}{2}=\dfrac{4}{10}+\dfrac{15}{10}=\dfrac{19}{10}\)

\(\dfrac{1}{2}:\dfrac{2}{5}=\dfrac{1}{2}\times\dfrac{5}{2}=\dfrac{5}{4}\)

\(\dfrac{5}{6}\times4=\dfrac{20}{6}\)

\(\dfrac{7}{15}+\dfrac{4}{5}=\dfrac{7}{15}+\dfrac{12}{15}=\dfrac{19}{15}\)

\(\dfrac{7}{8}-\dfrac{2}{3}=\dfrac{21}{24}-\dfrac{16}{24}=\dfrac{5}{24}\)

\(\dfrac{4}{7}\times2=\dfrac{8}{7}\)

\(\dfrac{9}{5}:\dfrac{1}{6}=\dfrac{9}{5}\times6=\dfrac{54}{5}\)