4^(k+1)=4*4^k........................................
<span>а) f`(x) = (</span>x^4-3x^3+3x-1)` = (x^4)`+(-3x^3)`+(3x)`+(-1)` = 4x^3-9x^2+3
б) f`(x) = (3x^7+2x^6+6x^5-3x^4+6x^2-13x+5)` = (3x^7)`+(2x^6)`+(6x^5)`+(-3x^4)`+(6x^2)`+(-13x)`+5` = 21x^6+12x^5+30x^4-12x^3+12x-13