设u=2-x
则:f(x)=2f(u)-x^2+8x-8 ,u=2-x
则:f'(x)=[2f(u)]'-2x+8
=2*[f'(u)|u]*[u'|x]-2x+8 (复合函数求导)
=2f'(u)*[2-x]'-2x+8
=2f'(u)(-1)-2x+8
=-2f(2-x)-x^2+8x-8
设u=2-x
则:f(x)=2f(u)-x^2+8x-8 ,u=2-x
则:f'(x)=[2f(u)]'-2x+8
=2*[f'(u)|u]*[u'|x]-2x+8 (复合函数求导)
=2f'(u)*[2-x]'-2x+8
=2f'(u)(-1)-2x+8
=-2f(2-x)-x^2+8x-8