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这里有多少个三角形?关键是是否能迅速建立 …
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问题很简单,根据你的观察,图中你能看到几 …
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请用七条直线组成尽可能多的三角形。但是每 …
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一位在咖啡馆做兼职的数学家为了推广价格公 …
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图中共有多少个长方形?仔细数一数。 答案 …
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