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阿Q吧 > 一个剧场设置座位，第一排有76个座位，往后排逐排比前一排多2个座位，最后一排154个座位，这个剧场

一个剧场设置座位，第一排有76个座位，往后排逐排比前一排多2个座位，最后一排154个座位，这个剧场

有多少个座位

2025-03-28 10:54:31

推荐回答（2个）

回答1：

把座位数可以看作是一个等差数列：首项是76，末项是154，公差是2，求这个剧场共有几排座位，相当于求等差数列的项数，列式是（154-76）÷2+1=40，
76+152）×40÷2
=228×40÷2
=4560（个）
答：这个剧场一共有4560个座位．

回答2：

图

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