Mathematics
Senior High
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第二小題為什麼我的算法(畫螢光筆的那個)是錯的
(2)1+:
1
1
+
1+2
1+2+3
姗
1+2+3+...+n (2+2)
-+1
1+2
(It the
+4
(2n-1) (2n+1)
6
(n+1)(n+y) (n+1)(n+y)
n
24+1
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