Question

limn趋向正无穷大.n-1/2n+1的极限是

Answer 1

lim (n-1) / (2n+1)

上下同除以n

=lim (1-(1/n)) / (2+(1/n))

明显地,

当n趋于无穷时,1/n趋于0

故

=(1-0) / (2+0)

=1/2

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