x²-6x+8)/(x²-5x+4)
=(x-2)(x-4)/(x-1)(x-4)
=(x-2)/(x-1)
=4-2/4-1
=2/3
(x^2-6x+8)/(x^2-5x+4)
=(x²-5x+4-x+4)/(x²-5x+4)
=1+(4-x)/(x²-5x+4)
=1+1/(1-x)
=1+1
=2
lim(x→0)(x²-6x+8)/(x²-5x+4)
=lim(x→0)(x-2)(x-4)/(x-1)(x-4)
=lim(x→0)(x-2)/(x-1)
=-2/(-1)
=2
。。。。。等于2