36a^5c^2 / 24a^4c^5=3a / 2c^3. сокращаем числитель и знаменатель на 12a^4c^2.
A)
f ' (x) = 1/3*3x^2 + 2x + 2 = x^2 + 2x + 2
b)
f ' (x) = (2/x^3 - x) ' = 2*(1/x^3) ' - (x)' = 2*(x^(-3))' - 1 =
= - 3*2*x^(-4) - 1 = - 6x^(-4) - 1
4х^2-(4х^2-4х+1)=15
4х^2-4х^2+4х-1=15, 4х=16, Х=4
F(x) = √(x + 1
x + 1 ≥ 0
x ≥ -1
D(x) = [-1 ; + ≈)