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123456加到100多少
更新时间: 2020-09-21 00:00:00  

解题方法一如下:

先把1和100相加,得到101,再把2和99相加,也得101,最后50和51相加,也得101。

一共有50个101,结果是5050。

解题方法二如下:

运用等差数列的知识,起始项是1,最后一项是100,公差是1,一共100个数,即总数n是100。

等差数列求和公式是:总数n乘以起始项1,加上2分之总数n乘以n减1的差再乘以公差,结果是5050。

关键词: 多少

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