3/4=15/20 7:5=77/55 12/18=14/21

Сократим дроби и добавим другие, значения которых 3/4.

1) 3/4 = 15/20 = 18/24 = 30/40 = 33/44 = 36/48;

(15 : 5) / (20 : 5) = 3/4.

18/24 = (18 : 6) / (24 : 6) = 3/4;

30/40 = (30 : 10) / (40 : 10) = 3/4;

33/44 = (33 : 11) / (44 : 11) = 3/4;

36/48 = (36 : 12) / (48 : 12) = 3/4;

Добавим 21/15 и 49/35, которые равны 7/5.

2) 7 : 5 = 77/55 = 21/15 = 49/35.

77/55 = (77 : 11) / (55 : 11) = 7/5;

21/15 = (21 : 3) / (15 : 3) = 7/5;

49/35 = (49 : 7) / (35 : 7) = 7/5;

Добавим 2/3 и 16/24.

3) 12/18 = 14/21 = 2/3 = 16/24.

12/18 = (12 : 6) / (18 : 6) = 2/3;

(14 : 7) / (21 : 7) = 2/3;

16/24 = (16 : 8) / (24 : 8) = 2/3.