Question

1/ Quy đồng mẫu các phân số :\(\dfrac{-3}{4}\);\(\dfrac{5}{9}\);\(\dfrac{2}{3}\)

 

Answer 1

Answer 2

\(\dfrac{-3}{4}=\dfrac{-3.9}{4.9}=\dfrac{-27}{36}\)

\(\dfrac{5}{9}=\dfrac{5.4}{9.4}=\dfrac{20}{36}\)

\(\dfrac{2}{3}=\dfrac{2.12}{3.12}=\dfrac{24}{36}\)

Answer 3

BCNN (4,9,3) = 36

\(\dfrac{-3}{4}=\dfrac{-3.9}{4.9}=\dfrac{-27}{36}\)

\(\dfrac{5}{9}=\dfrac{5.4}{9.4}=\dfrac{20}{36}\)

\(\dfrac{2}{3}=\dfrac{2.12}{3.12}=\dfrac{24}{36}\)