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数列找规律
数列找规律
Aug 23, 2026
1 min read
(
−
1
)
n
(正负参差)
1, -3, 5, -7 …
(
2
n
−
1
)
(
−
1
)
n
-1, 3, -5, 7 …
(
2
n
−
1
)
(
−
1
)
n
+
1
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