lim【n→∞】(2n²-3n+1)/(n+1)×sin(1/n)
=lim【n→∞】(2n²-3n+1)/(n+1)×(1/n)
=lim【n→∞】(2n²-3n+1)/(n²+n)
=lim【n→∞】(2-3/n+1/n²)/(1+1/n)
=(2-0+0)/(1+0)
=2
答案：2
求极限：lim((2n∧2-3n+1)/n+1)×sin n趋于无穷
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