把自然数1,2,3,4,5……98,99分成三组,如果每组数的平均数刚好相等,那么此平均数为( ) A. 55 B. 60 C. 45 D. 50

作者: rantiku 人气: - 评论: 0
问题 把自然数1,2,3,4,5……98,99分成三组,如果每组数的平均数刚好相等,那么此平均数为( ) A. 55 B. 60 C. 45 D. 50
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答案 D
解析 解题指导: (1+2+……+99)=4950,那么每组的平均数为4950/3/33=50。故答案为D。

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