№1.
28/35 = (28:7)/(35:7) = 4/5
44/88 = 1/2
196/84 = (196 : 28)/(84: 28) = 7/3
№2.
11/12 = 44/48 ; 13/16 = 39/48 ; 44/48 > 39/48 ⇒ 11/12 > 13/16
17/48 = 51/144 ; 25/72 = 50/144 ; 51/144> 50/144 ⇒ 17/48 > 25/72
№3.
5/6 - 3/4 = (5*2 - 3*3)/12 = 1/12
9/14 + 8/21 = (9*3 + 8*2)/42 = (27+16)/42 = 43/42 = 1 ц. 1/42
7/9 + 5/12 - 3/4 = (7*4 + 5*3 - 3*9)/36 = (28+15 - 27) = 16/36 = 4/9
№4.
1) 5/12 - 1/8 = (5*2 - 1*3)/24 = 7/24 всего луга скосили во II день
2) 5/12 + 7/24 = (5*2 + 7)/24 = 17/24
Ответ: 17/24 всего пути скосили за два дня.
№5.
4/5 = 12/15
3/5 = 9/15
4/5 > 10/15 > 3/5
4/5 > 11/15 > 3/5
Ответ: 10/15 ; 11/15 .