Question

Сократите дробь,используя признак делимости: 11/22 10/25 27/45 9/12 15/18 24/30 28/32 21/15 75/45 38/66 54/90 36/84 49/56 55/77 26/65 51/ 85

Answer 1

11/22==11*1 / 11*2 = 1/2

10/25 = 2*5 / 5*5 =2/5

27/45 =3*9 / 5*9 = 3/5

9/12 =3*3/ 3*4=3/4

15/18 =3*5/ 3*6 = 5/6

24/30 = 4*6 / 5*6 = 4/5
 
28/32 = 4*7/ 4*8 = 7/8

21/15= 3*7/ 3*5 = 7/5
 
75/45 = 5*15/ 3*15 = 5/3
 
38/66= 2*19 / 2*33 = 19/33
 
54/90 =18*3 / 18*5=3/5

36/84 = 12*3/ 12* 7 = 3/7

49/56 =7*7/ 7*8 = 7/8

55/77=5*11/7*11= 5/7

26/65= 2*13/ 5*13 = 2/5
 
51/ 85=3*17/5*17 = 3/5