7 номер плеееес ребятааааа

A = 15, c = 12 1) 8a = 8*15 = 120 2) 8a^2 = 8*15*15 = 8*225 = 1800 3) 3c = 3*12 = 36 4) (1800 - 36)/a = (1764)/15 = 117.6 120 - 117.6 = 2.4