bonsoir vous pouvez m'aider svp

Bonsoir,

f(x) = (x^3)/2 - 3Vx + 5/x
f ‘(x) = (3x^2)/2 - 3x^(3/2)/2

f(x) = (2x - 5x^2)(3x + 4)
f ´(x) = u’v + uv’
u = 2x - 5x^2
u’ = 2 - 10x
v = 3x + 4
v’ = 3

f ‘(x) = (2 - 10x)(3x + 4) + 3(2x - 5x^2)
f ‘(x) = 2(1 - 5x)(3x + 4) + 3x(2 - xV5)

f(x) = (2x^3)/(x^2 +1)
f ´(x) = u / v
u = 2x^3
u’ = 6x^2
v = 3x + 4