Question

3-е задание не нужно,

Answer 1

f'(x)=(5*x^4-7*x^2-x)'=(5*x^4)'-(7*x^2)'-(x)'=5*(x^4)'-7*(x^2)'-1=
=5*4*x^(4-1)-7*x^(2-1)-1=20*x^3-14*x-1