Ответ:
Пошаговое объяснение:
-3 (a^2 - 2a) + 3 (-3a^2 - 6a) = -3a^2 + 6a - 9a^2 - 18a = 12a^2 - 12a
3 1/3 * 2 2/5 * (2 - 4 8/15 * 3/17) = 9 целых 3/5
1) 4 8/15 * 3/17 = 68/15 * 3/17 = (4*1)/(5*1) = 4/5
2) 2 - 4/5 = 1 1/5
3) 2 2/5 * 1 1/5 = 12/5 * 6/5 = 72/25
4) 3 1/3 * 72/25 = 10/3 * 72/25 = (2*24)/(1*5) = 48/5 = 9 3/5