第三题的1 2 5小题,急,谢谢啦
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1、......3n..............................3
lim--------------=lim--------------------=3/2
n→∞..2n+1.....n→∞........2+1/n
2、....cosn..............[-1,1]
lim---------=lim-----------------=0
n→∞...n...n→∞........n
5、.........................(√(n+1)-√n)(√(n+1)+√n)...................1
lim(√(n+1)-√n)=lim----------------------------=lim---------------------=0
n→∞.................n→∞.......√(n+1)+√n..........n→∞......√(n+1)+√n
lim--------------=lim--------------------=3/2
n→∞..2n+1.....n→∞........2+1/n
2、....cosn..............[-1,1]
lim---------=lim-----------------=0
n→∞...n...n→∞........n
5、.........................(√(n+1)-√n)(√(n+1)+√n)...................1
lim(√(n+1)-√n)=lim----------------------------=lim---------------------=0
n→∞.................n→∞.......√(n+1)+√n..........n→∞......√(n+1)+√n
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