a)
3/8=(3·3)/(8·3)=9/24
1/3=(1·8)/(3·8)=8/24
9/24 > 8/24 ,więc 3/8 > 1/3
b)
4/5=(4·9)/(5·9)=36/45
7/9=(7·5)/(9·5)=35/45
36/45 > 35/45 ,więc 4/5 > 7/9
c)
2/7=(2·8)/(7·8)=16/56
3/8=(3·7)/(8·7)=21/56
16/56 < 21/56 ,więc 2/7 < 3/8
