Question

[Sách Giáo Khoa]

Quy đồng mẫu các phân số sau :

a) \(\dfrac{11}{120}\) và \(\dfrac{7}{40}\)

b) \(\dfrac{24}{146}\) và \(\dfrac{6}{13}\)

c) \(\dfrac{7}{30};\dfrac{13}{60};\dfrac{-9}{40}\)

d) \(\dfrac{17}{60};\dfrac{-5}{18};\dfrac{-64}{90}\)

Answer 1

[Vân Kính]

a)\(\dfrac{11}{120};\dfrac{21}{120}\)

b)\(\dfrac{312}{1898};\dfrac{876}{1898}\)

c)\(\dfrac{28}{120};\dfrac{26}{120};\dfrac{-27}{120}\)

d)\(\dfrac{51}{180};\dfrac{-50}{180};\dfrac{-128}{180}\)