求解,极限,谢谢
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(1)
lim(n->∞) (n^2+n+1)/(3n^3-1)
=lim(n->∞) (1/n+1/n^2+1/n^3)/(3-1/n^3)
=0
(2)
let
1/y = 2/(x+1)
x+1 = 2y
x= 2y-1
lim(x->∞) [1 - 2/(x+1) ]^(3x)
=lim(y->∞) [1 - 1/y ]^[3(2y-1)]
=lim(y->∞) [1 - 1/y ]^(6y)
=e^(-6)
lim(n->∞) (n^2+n+1)/(3n^3-1)
=lim(n->∞) (1/n+1/n^2+1/n^3)/(3-1/n^3)
=0
(2)
let
1/y = 2/(x+1)
x+1 = 2y
x= 2y-1
lim(x->∞) [1 - 2/(x+1) ]^(3x)
=lim(y->∞) [1 - 1/y ]^[3(2y-1)]
=lim(y->∞) [1 - 1/y ]^(6y)
=e^(-6)
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