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前n个奇数的和
前
n
n
n
个奇数的和等于
n
n
n
的平方:
1
+
3
+
5
+
⋯
+
(
2
n
−
1
)
=
n
2
1+3+5+ \cdots + (2n-1) =n^2
1
+
3
+
5
+
⋯
+
(
2
n
−
1
)
=
n
2
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