Номер 815 плизз срочно

А) 1/3 и 3/4 1/3 = 2/6 и 1/2=3/61/2=2/4 и 3/41/3=4/12 и 3/4=9/12г) 4/5 и 3/74/5= 8/10 и 1/2= 5/103/7=6/14 и 1/2=7/144/5=28/35 и 3/7=15/35б) 1/4 и 5/61/4 и 1/2=2/45/6 и 1/2=3/61/4=3/12 и 3/6=6/12в)2/5 и 5/82/5=4/10 и 1/2=5/105/8 и 1/2=4/82/5= 16/40 и 5/8=25/40д)7/13 и 8/177/13=14/26 и 1/2=13/26 8/17=16/34 и 1/2=17/347/13=119/221 и 104/221е)8/17 и 10/198/17=16/34 и 1/2=17/3410/19=20/38 и 1/2=19/388/17= 152/323 и 170/323