Ж.
20/45 = 20:5/45:5 = 4/9
12/72 = 12:12/72:12 = 1/6
136/170 = 136:34/170:34 = 4/5
21/108 = 21:3/108:3 = 7/36
24/36 = 24:12/36:12 = 2/3
15/35 = 15:5/35:5 = 3/7
102/136 = 102:34/136:34 = 3/4
90/126 = 90:18/126:18 = 5/7
3/39 = 3:3/39:3 = 1/13
36/63 = 36:9/63:9 = 4/7
21/84 = 21:21/84:21 = 1/4
151/302 = 151:151/302:151 = 1/2
130/182 = 130:26/182:26 = 5/7
490/560 = 490:70/560:70 = 7/8
10/75 = 10:5/75:5 = 2/15
З.
48/68 = 48:4/68:4 = 12/17
18/72 = 18:18/72:18 = 1/4
24/70 = 24:2/70:2 = 12/35
110/154 = 110:22/154:22 = 5/7
36/60 = 36:12/60:12 = 3/5
7/63 = 7:7/63:7 = 1/9
20/64 = 20:4/64:4 = 5/16
112/144 = 112:16/144:16 = 7/9
56/140 = 56:28/140:28 = 2/5
10/85 = 10:5/85:5 = 2/17
280/480 = 280:40/480:40 = 7/12
17/51 = 17:17/51:17 = 1/3
36/90 = 36:18/90:18 = 2/5
13/65 = 13:13/65:13 = 1/5
20/80 = 20:20/80:20 = 1/4