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1 + 2 = 1 + 9 =

1 + 2 + 3 = 2 + 3 + 8 + 7 =

1 + 2 + 3 + 4 = 28 ¨C 6 ¨C 4 - 18=

1 + 2 + 3 + 4 + 5 = 7 + 8 + 13 + 22 =

1 + 2 + 3 + 4 + 5 + 6 = 5 + 7 + 9 + 11 + 13 + 15 =

1 + 2 + 3 + 4 + 5 + 6 + 7 =

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 =

10 ¨C 9 + 8 ¨C 7 + 6 ¨C 5 + 4 ¨C 3 + 2 ¨C 1 =

20 ¨C 18 + 16 ¨C 14 + 12 ¨C 10 + 8 ¨C 6 + 4 ¨C 2 =

Àý8¡¢1 + 2 + 3 + 4 + ???? + 98 + 99 + 100 =

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1¡¢1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 =

2¡¢5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 + 25 + 27 + 29 =

3¡¢100 + 99 ¨C 98 ¨C 97 + 96 + 95 ¨C 94 ¨C 93 +???+ 4 + 3 ¨C 2 ¨C 1 =

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6¡¢?³¬ÊеĻõ¼ÜÒ»¹²ÓÐ5²ã£¬×îÉÏÃæÒ»²ã·ÅÁË12Æ¿ÒûÁÏ£¬ÍùÏÂÿһ²ã¶¼±ÈËüµÄÉÏÒ»²ã¶à5Æ¿£¬Õâ¸ö»õ¼ÜÒ»¹²·ÅÁ˶àÉÙÆ¿ÒûÁÏ£¿

7¡¢(1)1 + 3 + 5 + ??? + 15 + 17 + 19 =

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