Question

lim

n→+∞

n2+2n+1

2n2-n+1

=______．

Answer 1

lim

n→+∞

n2+2n+1

2n2-n+1

=

lim

n→+∞

1+ 2 n + 1 n2

2- 1 n + 1 n2

=

1

2

．
故答案为：

1

2

．