Ответ:

Пошаговое объяснение:

1) 7/20 и 5/12 =

(7*3)/(20*3) и (5*5)/(12*5) = 21/60 и 25/60

2) 11/24 и 1/30 =

(11*5)/(24*5) и (1*4)/(30*4) = 55/120 и 4/120

3) 3/16 и 7/12 =

(3*3)/(16*3) и (7*4)/(12*4) =

9/48 и 28/48

4) 11/18 и 7/12 =

(11*4)/(18*4) и (7*6)/(12*6) =

44/72 и 42/72

5) 1/12 и 2/9 =

(1*3)/(12*3) и (2*4)/(9*4) =

3/36 и 8/36

6) 4/21 и 13/28 =

(4*4)/(21*4) и (13*3)/(28*3) = 16/84 и 39/84

7) 8/15 и 5/12 =

(8*4)/(15*4) и (5*5)/(12*5) =

32/60 и 25/60

8) 7/30 и 1/12 =

(7*2)/(30*2) и (1*5)/(12*5) =

14/60 и 5/60