A).6/49+2/7=6/49+14/49=20/49
b). 7/11-1/2=14/22-11/22=3/22
в). 6/35-3/14=84/490-105/490=-21/490
г). 9 4/5- 4 7/15×22=49/5-67/15×22=147/15-67/16×22=80/15×22=1760/15=117 5/15=117 3/5
д). 7/35+4/7=7/35+20/35=27/35
е).7/26-2/15=105/390-52/390=53/390
е).2 3/14-2/5=31/14-2/5=155/70-28/70=127/70=1 57/70