Question

[Nguyễn Ngọc Mỹ Linh]

Quy đồng mẫu số cho các phân số sau :\(\frac{1078}{2541}\) ; \(\frac{9764}{36615}\) ; \(\frac{56272}{263775}\)

Answer 1

[l҉o҉n҉g҉ d҉z҉]

\(\frac{1078}{2541}=\frac{14}{33}\); \(\frac{9764}{36615}=\frac{4}{15}\); \(\frac{56272}{263775}=\frac{16}{75}\)

33 = 3 . 11

15 = 3 . 5

75 = 3 . 5²

BCNN(33, 15, 75) = 3 . 5² . 11 = 825

825 : 33 = 25 ; 825 : 15 = 55 ; 825 : 75 = 11

=> \(\frac{14}{33}=\frac{14\cdot25}{33\cdot25}=\frac{350}{825}\); \(\frac{4}{15}=\frac{4\cdot55}{15\cdot55}=\frac{220}{825}\); \(\frac{16}{75}=\frac{16\cdot11}{75\cdot11}=\frac{176}{825}\)