8. Calculați a) (4/15+11/15)+(9/10+41/10); b) (17/16+15/16)+(12/13+14/13); c) (5/8+3/8+1/8)+(7/18+11/18); d) (8/14+5/14+1/14)+(1/3+2/3);
va rog ajutațimă e urgent (PLUS CA DAU COROANĂ)
