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Comments - 【魚魚創挑第十二期】那些年，兩三事 | Penana
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Comments - 【魚魚創挑第十二期】那些年，兩三事
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Softshell Glassy Snail
8*8+12*5= 64+60= 124 
4 months agoReply
可鹹甜
等差有公式啊，Sn=n(a+l)/2

叔叔只能用手機打的，英文無法用書寫體。

範例解法50沒說明原因會被扣分喔@.@
4 months agoReply
櫻
實在是太累了，懶得寫50的原因orz QwQ
4 months agoReply
紫玖島
看到數學就頭暈的me
感到十分佩服
4 months agoReply
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