from above?

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from above?
一道题limX→-∞
（X^2+X+3）/X^2
最后答案怎么会是1from above?
1我懂,from above或者from below怎么回事?怎么判断?

（X^2+X+3）/X^2=1+1/x+1/x^2
当X→-∞,第2项→-0,第3项→0（注意第2项的趋势!）
结果比1要小点.
再问：那如果是limX→∞ 2X/（X+5）呢？又可以怎么算？
再答：结果是2啊
再问：答案是2 from below，麻烦你教教我怎么做，谢谢了！给你加分哈！
再答：分的无所谓。需要的是X→-∞ 还是+∞? 你最好找教材查查。

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