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

lim
n→∞
3n+1
3n+1+2n
=
lim
n→∞
3n
3n
+
1
3n
3n+1
3n
+
2n
3n
=
1
3

故答案为:

1
3

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