某电影院共有座位n排,已知第一排的座位为m个,后一排总是比前一排多一个,则这个电影院中共有座位( )A:mn+n²/2B:mn+n(n-1)/2C:mn+nD:mn+n(n+1)/2
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![某电影院共有座位n排,已知第一排的座位为m个,后一排总是比前一排多一个,则这个电影院中共有座位( )A:mn+n²/2B:mn+n(n-1)/2C:mn+nD:mn+n(n+1)/2](/uploads/image/z/2672836-52-6.jpg?t=%E6%9F%90%E7%94%B5%E5%BD%B1%E9%99%A2%E5%85%B1%E6%9C%89%E5%BA%A7%E4%BD%8Dn%E6%8E%92%2C%E5%B7%B2%E7%9F%A5%E7%AC%AC%E4%B8%80%E6%8E%92%E7%9A%84%E5%BA%A7%E4%BD%8D%E4%B8%BAm%E4%B8%AA%2C%E5%90%8E%E4%B8%80%E6%8E%92%E6%80%BB%E6%98%AF%E6%AF%94%E5%89%8D%E4%B8%80%E6%8E%92%E5%A4%9A%E4%B8%80%E4%B8%AA%2C%E5%88%99%E8%BF%99%E4%B8%AA%E7%94%B5%E5%BD%B1%E9%99%A2%E4%B8%AD%E5%85%B1%E6%9C%89%E5%BA%A7%E4%BD%8D%EF%BC%88+%EF%BC%89A%EF%BC%9Amn%2Bn%26%23178%3B%2F2B%EF%BC%9Amn%2Bn%EF%BC%88n-1%EF%BC%89%2F2C%EF%BC%9Amn%2BnD%EF%BC%9Amn%2Bn%EF%BC%88n%2B1%EF%BC%89%2F2)
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