一堆钢管,最上层有5根,最下层有21根,如果自然堆码,这堆钢管最多能堆(  )根.A.208 B.221 C.416 D.442

作者: tihaiku 人气: - 评论: 0
问题 一堆钢管,最上层有5根,最下层有21根,如果自然堆码,这堆钢管最多能堆(  )根.
选项 A.208 B.221 C.416 D.442
答案 B
解析 如果是自然堆码,最多的情况是:每相邻的下一层比它的上一层多1根,即构成了以5为首项,1为公差的等差数列,故可知21为第17项,从而这堆钢管最多能堆

相关内容:钢管,上层,自然,堆码,这堆,.A.208

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