题型:填空题
难度:0.65
引用次数:121
题号:7292344
礼堂第一排有a个座位,后面每排都比前一排多一个座位.用式子表示第n排的座位数_____ .
更新时间:2018-12-11 12:39:46
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【推荐1】拓展探索:有若干个数,第一个数记为
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【推荐2】现有一列数
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