А)1/2=3/6, 1/3=2/6
3/6 > 2/6 или 1/2 > 1/3
б)1/7=4/28, 1/4=7/28
4/28 < 7/28 или 1/7 < 1/4
в)2/5=5/15, 2/3=10/15
5/15 < 10/15 или 2/5 < 2/3
г)3/5=21/35, 3/7=15/35
21/35 > 15/35 или 3/5 > 3/7
д)7/13=105/195, 7/15=91/195
105/195 > 91/195 или 7/13 >7/15
е) 8/7=88/77, 8/11=56/77
88/77 > 56/77 или 8/7 >8/11