1) F(x) = -cos2x/2 + C
-2 = 0 + C => C = -2
F(x) = -cos2x/2 - 2
2) F(x) = 2x² - 2x³ + x + C
2 = 0 + C => C = 2
F(x) = 2x² - 2x³ + x + 2
9^+5x=1.8×25(45)+5x
81-45=5x-5x
=36
Решение смотрите на фотографии
27a^2 - 18ab=3a*9a-2b*9a=9a(3a-2b)
-6(0,5х-1,5)-4,5х-8= -3х+9-4,5х-8= 1-7,5х
при х=2/3
1-7,5*2/3=1-5=-4