计算极限x→2,limx²－3x＋2／x²－4,
问题描述：
计算极限x→2,limx²－3x＋2／x²－4,
答
(x²-3x+2)/(x²-4)
=(x-1)(x-2)/(x+2)(x-2)
=(x-1)/(x+2)
limx->2 (x-1)/(x+2)=1/4