Сократить дробь: 8/12; 12/16; 24/40; 18/27; 20/70; 8/36; 30/75; 9/45; 11/66; 5/35; 15/25; 81/90; 16/48; 17/51; 14/49; 20/118; 66/102; 640/720.

8/12=2/3
12/16=3/4
24/40=3/5
18/27=2/3
20/70=2/7
8/36=1/2
9/45=1/5
11/66=1/6
5/35=1/7
81/90=9/10
16/48=1/3
17/51=1/3
14/49=2/7

2/3; 3/4; 3/5; 2/3; 2/7; 2/9; 2/5; 1/5; 1/6; 1/7; 3/5; 9/10; 1/3; 1/3; 2/7; 5/29; 11/17; 8/9;