Question

làm giúp mik acsc bài này nhanh vs ạ

qui đồng mẫu các phân số

a. 8/15 , -7/18 , 13/90

b. 5/12 , -11/15 , 49/-69

c. 7/30 , 13/60 , -9/-40

d. 17/60 , -5/18 , -64/90

Answer 1

a, MC =90

b, MC =1380

c,MC =120

d, MC =180

Answer 2

a/ MC: 90

\(\frac{8}{15}=\frac{48}{90}\) ; \(\frac{-7}{18}=\frac{-35}{90}\) ; \(\frac{13}{90}\)

b/ MC: 1380

\(\frac{5}{12}=\frac{575}{1380}\) ; \(\frac{-11}{15}=\frac{-1012}{1380}\) ; \(\frac{49}{-69}=\frac{-980}{1380}\)

c/ MC: 120

\(\frac{7}{30}=\frac{28}{120}\) ; \(\frac{13}{60}=\frac{26}{120}\) ; \(\frac{-9}{-40}=\frac{9}{40}=\frac{27}{120}\)

d/ MC: 180

\(\frac{17}{60}=\frac{51}{180}\) ; \(\frac{-5}{18}=\frac{-50}{180}\) ; \(\frac{-64}{90}=\frac{-128}{180}\)