[其他] 國一的點對點距離解
關於第 4 題：
http://i.imgur.com/jxglNlS.jpg
答案是 A？應該沒錯？
但要怎樣寫成完整的公式讓國一生能理解？
國一和數學都離我十幾年以上了 QQ
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