问题 填空题
计算:
lim
n→∞
(n+1)(1-3n)
(2-n)(n2+n+1)
=______.
答案

lim
n→∞
(n+1)(1-3n)
(2-n)(n2+n+1)
=
lim
n→∞
1
n
(1+ 
1
n
)(
1
n
-3)
(
2
n
-1)(1+
1
n2
1
n
)
=0

故答案为:0

单项选择题 B型题
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