Найдите произведения: 3/7*5/11, 6/25*5/18, 2 1/10*1 1/14, 3 3/5*1 1/9, 1 3/7*14 )40

3/7*5/11=15/77
6/25*5/12=1/15
21/10*11/14=33/20
33/5*11/9=121/15
13/7*14=26

3/7×5/11=15/77; 6/25×5/18=1/5×1/3=1/15; 2 1/10×1 1/14=21/10×15/14=3/2×3/2=9/6=1 3/6=1 1/2; 3 3/5×1 1/9=18/5×10/9=2/1×2/1=4/2=2; 1 3/7×14=10/7×14/1=140/7=20