f(x)=2xf'(x)+x^2两边求导:f'(x)=2xf"(x)+2f'(x)+2x,即:2xf"(x)+f'(x)+2x=0当x=1时,有:2f"(1)+f'(1)+2=0又f(1)=2f'(1)+1两边求导:f'(1)=2f"(1)联合解方程,得:f'(1)=-1