Répondre :
f(x) = x²/4 - 3x/5 + 2
f'(x)=x/2-3/5
f(x) = -3/x
f'(x)=3/x²
f(x) = (7x -2 )/( 5x +4)
f'(x)=(7(5x+4)-5(7x-2))/(5x+4)²
=38/(5x+4)²
f'(x)=x/2-3/5
f(x) = -3/x
f'(x)=3/x²
f(x) = (7x -2 )/( 5x +4)
f'(x)=(7(5x+4)-5(7x-2))/(5x+4)²
=38/(5x+4)²