Сокращение обыкновенных дробей 6/9; 12/15; 18/21; 30/33; 24/27; 36/39; 5/15; 10/35; 6/18; 14/49; 16/40; 100/200

6/9=2/3,12/15=4/5,18/21=6/7,30/33=10/11,24/27=8/9,36/39=12/13,5/15=1/3,10/35=2/7,6/18=1/3,14/49=2/7,16/40=4/10,100/200=1/2.