va rog din suflet. a)2/7+?=5/7; ?+3/8=7/8; 4/9+?=1; b)?+1/10=1; 8/9-?=2/9; 5/6-?=4/6; c)?-2/11=6/11; ?-2/7=4/7; ?-3/5=2/5; d)1/4+?=1; 1-?=1/6; 1-?=2/3;