Question

cảm ơn trước nhe mn ^-^ (. là nhân nhé)

a)0,2.\(\dfrac{15}{36}\)-(\(\dfrac{2}{5}\)+\(\dfrac{2}{3}\)):1\(\dfrac{1}{5}\)

b)1\(\dfrac{13}{15}\).0,75-(\(\dfrac{8}{15}\)+0,25).\(\dfrac{24}{47}\)

c)5:(4\(\dfrac{3}{4}\)-1\(\dfrac{25}{28}\))-1\(\dfrac{3}{8}\):(\(\dfrac{3}{8}\)+\(\dfrac{9}{20}\))

Answer 1

a) \(0,2\cdot\dfrac{15}{36}-\left(\dfrac{2}{5}+\dfrac{2}{3}\right):1\dfrac{1}{5}\)

\(=\dfrac{1}{12}-\dfrac{16}{15}\cdot\dfrac{5}{6}\)

\(=\dfrac{1}{12}-\dfrac{8}{9}\)

\(=\dfrac{-29}{36}\)

b) \(1\dfrac{13}{15}\cdot0,75-\left(\dfrac{8}{15}+0,25\right)\cdot\dfrac{24}{27}\)

\(=\dfrac{28}{15}\cdot0,75-\dfrac{47}{60}\cdot\dfrac{24}{27}\)

\(=\dfrac{7}{5}-\dfrac{94}{135}\)

\(=\dfrac{19}{27}\)

c) \(5:\left(4\dfrac{3}{4}-1\dfrac{25}{28}\right)-1\dfrac{3}{8}:\left(\dfrac{3}{8}+\dfrac{9}{20}\right)\)

\(=5\cdot\dfrac{7}{20}-\dfrac{11}{8}\cdot\dfrac{40}{33}\)

\(=\dfrac{7}{4}-\dfrac{5}{3}\)

\(=\dfrac{1}{12}\)