Question

Quy đồng mẫu số các phân số sau :

4/5 ; 8/15 ; -3/2

2;-10;7/-9

Answer 1

\(\dfrac{72}{90};\dfrac{48}{90};\dfrac{-135}{90};\dfrac{-900}{90};\dfrac{-70}{90}\)

Answer 2

Ta có: \(\dfrac{4}{5}=\dfrac{72}{90}\);\(\dfrac{8}{15}=\dfrac{48}{90}\);\(\dfrac{-3}{2}=\dfrac{-135}{90}\);\(\dfrac{-2}{10}=\dfrac{-18}{90}\);\(\dfrac{-7}{9}=\dfrac{-70}{90}\)