设3/7用小数来表示时其小数点后第2010个数字为a,且 b =b+ 2010,则 2b+10a -(b+5a)的值为()。 A.2400 B.2600...

作者: tihaiku 人气: - 评论: 0
问题 设3/7用小数来表示时其小数点后第2010个数字为a,且 b =b+ 2010,则 2b+10a -(b+5a)的值为()。 A.2400 B.2600 C.2800 D.3000
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答案 D
解析 3/7 = 0. 428571428571…,小数部分以6为周期循环出现,2010 / 6 = 335,所以第2010个数字是1,即a =1;由 b =b+2010可得,b=-1005。代入 2b+10a -(b+5a),结果为3000。

相关内容:小数,时其,小数点,2010个,数字,2b+10a,A.2400,B.2600...

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