一道初中数学竞赛难题,高手来啊一摩天大楼有n级台阶,登楼时一步可上一个台阶,也可上两个台阶,所有不同的登楼方式记为a(n). 求a(1)+a(2)+···+a(1997)被7除的余数.答案:a(16k+1)+a(16k+2)+··
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![一道初中数学竞赛难题,高手来啊一摩天大楼有n级台阶,登楼时一步可上一个台阶,也可上两个台阶,所有不同的登楼方式记为a(n). 求a(1)+a(2)+···+a(1997)被7除的余数.答案:a(16k+1)+a(16k+2)+··](/uploads/image/z/7063260-60-0.jpg?t=%E4%B8%80%E9%81%93%E5%88%9D%E4%B8%AD%E6%95%B0%E5%AD%A6%E7%AB%9E%E8%B5%9B%E9%9A%BE%E9%A2%98%2C%E9%AB%98%E6%89%8B%E6%9D%A5%E5%95%8A%E4%B8%80%E6%91%A9%E5%A4%A9%E5%A4%A7%E6%A5%BC%E6%9C%89n%E7%BA%A7%E5%8F%B0%E9%98%B6%2C%E7%99%BB%E6%A5%BC%E6%97%B6%E4%B8%80%E6%AD%A5%E5%8F%AF%E4%B8%8A%E4%B8%80%E4%B8%AA%E5%8F%B0%E9%98%B6%2C%E4%B9%9F%E5%8F%AF%E4%B8%8A%E4%B8%A4%E4%B8%AA%E5%8F%B0%E9%98%B6%2C%E6%89%80%E6%9C%89%E4%B8%8D%E5%90%8C%E7%9A%84%E7%99%BB%E6%A5%BC%E6%96%B9%E5%BC%8F%E8%AE%B0%E4%B8%BAa%28n%29.+%E6%B1%82a%281%29%2Ba%282%29%2B%C2%B7%C2%B7%C2%B7%2Ba%281997%29%E8%A2%AB7%E9%99%A4%E7%9A%84%E4%BD%99%E6%95%B0.%E7%AD%94%E6%A1%88%EF%BC%9Aa%EF%BC%8816k%2B1%EF%BC%89%2Ba%EF%BC%8816k%2B2%EF%BC%89%2B%C2%B7%C2%B7)
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