usa la división para hallar la fracción desconocida
5/6 x ?/? = 2/3
?/? x 3/5 = 4/9
?/? x 5/7 = 1/2
POR FAVOR¡¡¡¡
lizzytracker
5/6 x x = 2/3 ~ x = (2/3)/5/6 ~ x = 2x6/3x5 ~ x = 18/15 ~ x = 6/5. | x x3/5 = 4/9 ~ x = (4/9)/3/5 ~ x = (4x5)/ 9x3 ~ x = 20/18 ~ 10/9. | x x 5/7 = 1/2 ~ x = (1/2)/5/7 =1x7/2x5 = 7/10