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?

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? Blessed From Above Blessed From Above是什么意思? death from above 歌词 REVOLUTION FROM ABOVE怎么样 请教一道极限题limx→0 （sinx-（tanx）^2）/2arcsinx求极限, 求导数的一道题limx(π/2-arctanx)x→+∞ 一道求导数的题limx^(1/1-x}x→1 Group the words from above. Death From Above啥意思? 求解一道极限题 limx→2(x^3+3x^2-12x+4) /(x^3-4x) 一道GRE逻辑题求教No.6第三套题的一道逻辑题：Nursing homes range from three to five stories in height. If a nursing home room is above the first floor, it has a fire escape. If the above statements are true, which of the following mus Find the following words from the above you are my angle sent from above 一道高数导数题和极限的问题已知f(x)在x=0的领域存在二阶导.已知limx→0（1+x+f(x)/x）的(1/x)次方为e的3次方.求f(0),f'(0),f''(0).求极限limx→0（1+f(x)/x）的(1/x)次方 limx→∞ arctanx/x 极限,limx→∞cosx limx→0 tan2x/sinx