已知liman=2求lim((n+an)/(n-an))

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已知liman=2求lim((n+an)/(n-an))

已知liman=2求lim((n+an)/(n-an))
已知liman=2求lim((n+an)/(n-an))

已知liman=2求lim((n+an)/(n-an))
lim((n+an)/(n-an))
=lim{[(n-an)+2an]/(n-an)}
=lim1+lim(2an/(n-an))
=1+2*lim{1/[(n/an)-1}.
=1+2*1/{lim[(n/an)-1]}.
=1+2*0
=1.