http://ppt.cc/Zf-Y
請問這題除了代數字和直接乘開
還有什麼方法嗎
為他看起來很對稱感覺有什麼性質可以用
但翻了書還是沒頭緒XD
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10/28 15:45, , 1F
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01/02 15:34,
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07/07 11:35,
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07/07 11:35, 17F