f(x)=(x方 ax-2)/(x方-x 1)CF=CA AF=CA AB/2
问题描述：
f(x)=(x方 ax-2)/(x方-x 1)CF=CA AF=CA AB/2
(x^2)^2 2*5*x^2 5^2-[(5x)^2-2*1*5x 1^2]=0y'=2x-4>0 (3≤x≤5)
答
BE=BC CE=BC CA/2x2^2-ax2)/(x1^2-ax1)>0 相对0 (BC CA AB)/2相对BE=BC CE=BC CA/2