Question

Answer 1

Bài 1 

a)  \(\dfrac{5}{12}+\dfrac{3}{4}+\dfrac{1}{3}=\dfrac{5}{12}+\dfrac{9}{12}+\dfrac{4}{12}=\dfrac{18}{12}=\dfrac{3}{2}\)

b) \(\dfrac{1}{4}+\dfrac{3}{7}+\dfrac{11}{14}=\dfrac{7}{28}+\dfrac{12}{28}+\dfrac{22}{28}=\dfrac{41}{28}\)

Bài 2

a) \(x\div\dfrac{3}{8}=\dfrac{5}{6}\)

   \(x=\dfrac{5}{6}\times\dfrac{3}{8}\)

   \(x=\dfrac{5}{16}\)

b) \(\dfrac{23}{69}-x=\dfrac{17}{153}\)

             \(x=\dfrac{23}{69}-\dfrac{17}{153}\)

             \(x=\dfrac{2}{9}\)