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230问答网 > 把第一个数加上1,第二个数减去2,第3个数加上3,以此类推到100,结果?怎么算的、要过程

把第一个数加上1,第二个数减去2,第3个数加上3,以此类推到100,结果?怎么算的、要过程

2025-03-15 00:02:26

推荐回答（1个）

回答1：

1、不知道原来的数列是什么,在这就加深为An；
2、A1+1 + A2-2 A3+3 .A99+1 + A100-100
3、A1+A2+.+A100+(1-2)+(3-4).(99-100)
4、A1+A2+.+A100 -100/2

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