f(x) = x
3/3 + 2x
2 + 4x - 5
7
 f ' (x) = (1/9)*x^2  +4x +4 
b) f(x) = 10/x3 - 6* 3√(x2) + 4*4√(x3)
= 10x^{-3}  - 6 * x ^{2/3}  + 4* x^{3/4} 
f ' (x) =  10*(-3) * x^{-4}  - 6 * (2/3) * x ^{-1/3}  + 4 *(3/4) * x^{-1/4} 
c) f(x) = xlog (x)produktregel: f ' (x) = 1+log(x) + x * 1/x
d) f(x) = 2x
3e
x - 3
x+e
5  =  2x^3 * e^x  - e 
x*ln(3) + e^5 
   f ' (x) = 2x^3 * e^x  + 6x^2 * e^x - ln(3)* e 
x*ln(3)