1 f(x)=lnx-ax-3 f'(x)=1/x-a g(x)=x^2+(x^2/2)(m-2/x+2a)=[1+(m+2a)/2]x^2-x x1+x2=1/[1+(m+2a)/2]=2/(2+m+2a) (x1+x2)/2=1/(2+m+2a) a<1/(2+m+2a)<3 1/3<2+m+2a<1/2 -2a+1/3-2
