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?
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?
![from above?](/uploads/image/z/17964744-24-4.jpg?t=from+above%3F)
(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。
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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