А) 17 к 25 = 17/25= 68/100 = 68\%
2/5+3/5=5/5=1
1/9+5/9=6/9=2/3
13/29-2/29=11/29
3/7-2/7=1/7
6/23-2/23=4/23
11/51+13/51=24/51