lim[(2n-1)an]=2,求limnan
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lim[(2n-1)an]=2,求limnan
lim[(2n-1)an]=2,求limnan
lim[(2n-1)an]=2,求limnan
这是数列极限,an中的n应该是下标吧,莪用(an)表示之.
lim(n->∞) n(an)
=lim(n->∞) [n/(2n-1)]*[(2n-1)*(an)]
=lim(n->∞) n/(2n-1) * lim(n->∞) (2n-1)*(an)
=lim(n->∞) 1/(2-1/n) * lim(n->∞) (2n-1)*(an)
=1/(2-0) * 2
=1
lim就是求极限的那个 lim(2n-1)an=lim2nan-liman=2limnan-liman 很显然liman=0,如果不是这样,则容易证明lim(2n-1)an=正无穷大或负无穷大
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