50个数字1,2,3,2,3,4,3,4,5,4,5,6,5,6,7,6,7,8

Freeti2019-12-17  7

问题 50个数字1,2,3,2,3,4,3,4,5,4,5,6,5,6,7,6,7,8,……之和是:

选项 A.568B.497C.523D.491

答案D

解析[img]/upload/tiku/378/4271725_1.jpg[/img]
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