Question

5/12+5/3+2/12+2/3

5/9.7/13+5/9-5/9.3/13

Answer 1

loi nhanh nha

Answer 2

\(a)\dfrac{5}{12}+\dfrac{5}{3}+\dfrac{2}{12}+\dfrac{2}{3}\)

\(=\left(\dfrac{5}{12}+\dfrac{2}{12}\right)+\left(\dfrac{5}{3}+\dfrac{2}{3}\right)\)

\(=\dfrac{7}{12}+\dfrac{7}{3}\)

\(=\dfrac{7}{12}+\dfrac{28}{12}\)

\(=\dfrac{35}{12}\)

\(b)\dfrac{5}{9}.\dfrac{7}{13}+\dfrac{5}{9}-\dfrac{5}{9}.\dfrac{3}{13}\)

\(=\dfrac{5}{9}.1.\dfrac{7}{13}+\dfrac{5}{9}-\dfrac{5}{9}.\dfrac{3}{13}\)

\(=\dfrac{5}{9}.\left(1+\dfrac{7}{13}-\dfrac{3}{13}\right)\)

\(=\dfrac{5}{9}.\dfrac{17}{13}\)

\(=\dfrac{85}{117}\)