求教数学题:某礼堂第一排有20个座位,后面每一排比前一排多一个座位,那么此礼堂至少有多少某礼堂第一排有20个座位,后面每一排比前一排多一个座位,那么此礼堂至少有多少排座位才能使
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![求教数学题:某礼堂第一排有20个座位,后面每一排比前一排多一个座位,那么此礼堂至少有多少某礼堂第一排有20个座位,后面每一排比前一排多一个座位,那么此礼堂至少有多少排座位才能使](/uploads/image/z/3505995-27-5.jpg?t=%E6%B1%82%E6%95%99%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%9A%E6%9F%90%E7%A4%BC%E5%A0%82%E7%AC%AC%E4%B8%80%E6%8E%92%E6%9C%8920%E4%B8%AA%E5%BA%A7%E4%BD%8D%2C%E5%90%8E%E9%9D%A2%E6%AF%8F%E4%B8%80%E6%8E%92%E6%AF%94%E5%89%8D%E4%B8%80%E6%8E%92%E5%A4%9A%E4%B8%80%E4%B8%AA%E5%BA%A7%E4%BD%8D%2C%E9%82%A3%E4%B9%88%E6%AD%A4%E7%A4%BC%E5%A0%82%E8%87%B3%E5%B0%91%E6%9C%89%E5%A4%9A%E5%B0%91%E6%9F%90%E7%A4%BC%E5%A0%82%E7%AC%AC%E4%B8%80%E6%8E%92%E6%9C%8920%E4%B8%AA%E5%BA%A7%E4%BD%8D%2C%E5%90%8E%E9%9D%A2%E6%AF%8F%E4%B8%80%E6%8E%92%E6%AF%94%E5%89%8D%E4%B8%80%E6%8E%92%E5%A4%9A%E4%B8%80%E4%B8%AA%E5%BA%A7%E4%BD%8D%2C%E9%82%A3%E4%B9%88%E6%AD%A4%E7%A4%BC%E5%A0%82%E8%87%B3%E5%B0%91%E6%9C%89%E5%A4%9A%E5%B0%91%E6%8E%92%E5%BA%A7%E4%BD%8D%E6%89%8D%E8%83%BD%E4%BD%BF)
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