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=2/312/16=3/424/40=3/518/27=2/320/70=2/78/36=1/29/45=1/511/66=1/65/35=1/781/90=9/1016/48=1/317/51=1/314/49=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;