问题
填空题
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答案
lim n→∞
=
+2C 2n C n-2n (n+1)2 lim n→∞
=
+2×n(n-1) 2 n(n-1) 2 n2+2n+1 lim n→∞
=
n2 -3 2
n3 2 n2+2n+1 lim n→∞
=
-3 2 3 2n 1+
+2 n 1 n2
．3 2
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|
lim n→∞
=
+2C 2n C n-2n (n+1)2 lim n→∞
=
+2×n(n-1) 2 n(n-1) 2 n2+2n+1 lim n→∞
=
n2 -3 2
n3 2 n2+2n+1 lim n→∞
=
-3 2 3 2n 1+
+2 n 1 n2
．3 2