lim(n趋于无穷大)(5n^2+3n)/(an^2+b)=多少

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lim(n趋于无穷大)(5n^2+3n)/(an^2+b)=多少
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lim(n趋于无穷大)(5n^2+3n)/(an^2+b)=多少
lim(n趋于无穷大)(5n^2+3n)/(an^2+b)=多少

lim(n趋于无穷大)(5n^2+3n)/(an^2+b)=多少
n趋于无穷大看最高项,因此
lim(n趋于无穷大)(5n^2+3n)/(an^2+b)
=lim(n趋于无穷大)5n^2/an^2
=5/a