电影院一共有22排座位,第一排有24个座位,后面每排都比前一排多2个座位,一共有多少个?
解:根据题意,这个电影院的谁人座位排次成等差数列,n=22,a1=24,d=2则:S=(a1+an)/2=(2a1+(n-1)d]/2=na1+n(n-1)d/2=22×24+22×(22-1)×2/2=528+462=990答:一共有990个座位。
解:根据题意,这个电影院的谁人座位排次成等差数列,n=22,a1=24,d=2则:S=(a1+an)/2=(2a1+(n-1)d]/2=na1+n(n-1)d/2=22×24+22×(22-1)×2/2=528+462=990答:一共有990个座位。
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