А) 765*15+235*15 = (765 + 235) * 15 = 1000 * 15 = 15000
Б) 45+21+15+49 = (45 + 15) + (21 + 49) = 60 + 70 = 130
А) 765*15+235*15 = (765 + 235) * 15 = 1000 * 15 = 15000
Б) 45+21+15+49 = (45 + 15) + (21 + 49) = 60 + 70 = 130