(x²-3x＋2)/x²-4
=（x-2)(x-1)\(x-2)(x+2)
=(x-1)\(x+2)
所以 原式=1\4
x→2 lim(x²-3x＋2)/x²-4
=x→2 lim(x-1)(x-2)/(x+2)(x-2)
=x→2 lim(x-1)/(x+2)
=(2-1)/(2+2)
=1/4
lim(x->2) (x^2-3x＋2)/(x^2-4)
=lim(x->2) (x-1)(x-2)/[(x-2)(x+2)]
=lim(x->2) (x-1)/(x+2)
=1/4
楼主，谁最快你就采谁吧。
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