Question

lim

n→∞

C 2n

2n2+1

=______．

Answer 1

lim

n→∞

C 2n

2n2+1

=

lim

n→∞

n(n-1) 2

2n2+1

=

lim

n→∞

n2-1

4n2+2

=

lim

n→∞

1- 1 n2

4+ 2 n2

=

1

4

．
故答案为：

1

4

．