y=x^3*(x-sqrt(x))
y'=3x^2(x-sqrt(x))+x^3(1-1/2sqrt(x))=4x^3-3,5x^2sqrt(x)
y=x^3(x-корень(x)
y' =3x^2(x-корень(x)) +x^3(1-1/(2корень(х)) =х^2(3x-3корень(x) +x - x/(2корень(x)) =
=x^2(4x-3корень(x)-x/(2корень(x))
