电影院里有24排座位,后一排比前一排多2个座位,最后一排有90个座位,这个电影院一共有多少个座位?
人气:390 ℃ 时间:2020-04-11 22:45:56
解答
第一排:90-2×(24-1),
=90-46,
=44(个);
(90+44)×24÷2,
=134×12,
=1608(个);
答:这个电影院一共有1608个座位.
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