求下列极限?
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(2)
lim(x->1+) |x-1|/(x-1) =1
lim(x->1-) |x-1|/(x-1) =-1
=>lim(x->1) |x-1|/(x-1) 不存在
(3)
lim(x->1+) e^[1/(x-1)] ->+∞
lim(x->1-) e^[1/(x-1)] =0
=>lim(x->1) e^[1/(x-1)] 不存在
(4)
lim(x->0) ( 1-cosx)/x^2
=lim(x->0) (1/2)x^2/x^2
=1/2
(5)
lim(n->∞) ( 1+ 1/n+ 1/n^2)^n
=lim(n->∞) ( 1+ 1/n)^n
=e
lim(x->1+) |x-1|/(x-1) =1
lim(x->1-) |x-1|/(x-1) =-1
=>lim(x->1) |x-1|/(x-1) 不存在
(3)
lim(x->1+) e^[1/(x-1)] ->+∞
lim(x->1-) e^[1/(x-1)] =0
=>lim(x->1) e^[1/(x-1)] 不存在
(4)
lim(x->0) ( 1-cosx)/x^2
=lim(x->0) (1/2)x^2/x^2
=1/2
(5)
lim(n->∞) ( 1+ 1/n+ 1/n^2)^n
=lim(n->∞) ( 1+ 1/n)^n
=e
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