Verified answer

Пошаговое объяснение:

1)

3/11; 2/13 и 4/5 =>

(3*65)/(11*65); (2*55)/(13*55) и (4*143)/(5*143) =>

195/715; 110/715; 572/715

2)

5/16; 6/7 и 2/9 =>

(5*63)/(16*63); (6*144)/(7*144) и (2*112)/(9*112) =>

315/1008; 864/1008 и 224/1008

3)

13/15; 5/8 и 1/11 =>

(13*88)/(15*88); (5*165)/(8*165) и (1*120)/(11*120) =>

1144/1320; 825/1320 и 120/1320

4)

7/19; 3/4 и 1/9 =>

(7*36)/(19*36); (3*171)/(4*171) и (1*76)/(9*76) =>

252/684; 513/684 и 76/684