(n²-1)/(an²+2)的极限=3,求a
人气:444 ℃ 时间:2020-05-30 21:20:21
解答
若n->无穷
则
上下同除n^2
=(1-1/n^2)/(a+2/n^2)
分子分母分别取极限
=(1-0)/(a+0)=3
a=1/3
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