1. y' = (x^5-2,5x ² + 3) '=5x^4-5x;
5x^4-5x=0;
5x (x ³-1) = 0;
x=0, x=1.
f (0) = 0^5-2,5*0 ²+3=3;
f (1) = 1^5-2,5*1 ²+3=1-2,5+3=1,5.
