观察这列数:1,2,3,2,1,2,3,4,3,2,3,4,5,4,3,4,5,6,5,4.,则第2013个数是()A.403 B.404 C.405 D.406
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![观察这列数:1,2,3,2,1,2,3,4,3,2,3,4,5,4,3,4,5,6,5,4.,则第2013个数是()A.403 B.404 C.405 D.406](/uploads/image/z/634649-41-9.jpg?t=%E8%A7%82%E5%AF%9F%E8%BF%99%E5%88%97%E6%95%B0%3A1%2C2%2C3%2C2%2C1%2C2%2C3%2C4%2C3%2C2%2C3%2C4%2C5%2C4%2C3%2C4%2C5%2C6%2C5%2C4.%2C%E5%88%99%E7%AC%AC2013%E4%B8%AA%E6%95%B0%E6%98%AF%EF%BC%88%EF%BC%89A.403++++++B.404+++++++C.405++++++++D.406)
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观察这列数:1,2,3,2,1,2,3,4,3,2,3,4,5,4,3,4,5,6,5,4.,则第2013个数是()A.403 B.404 C.405 D.406
观察这列数:1,2,3,2,1,2,3,4,3,2,3,4,5,4,3,4,5,6,5,4.,则第2013个数是()
A.403 B.404 C.405 D.406
观察这列数:1,2,3,2,1,2,3,4,3,2,3,4,5,4,3,4,5,6,5,4.,则第2013个数是()A.403 B.404 C.405 D.406
1,2,3,2,1,2,3,4,3,2,3,4,5,4,3,4,5,6,5,4 .,
3 4 5 6
五个一组 成对称分布
2013÷5=402……3
3+402=405
[(1,2,3,2,1.)(2,3,4,3,2,)(3,4,5,4,3,)(4,5,6,5,4,)……]
所以2013/5=402-------------3
所以是405
答案应该是C
1,2,3,2,1,;;;2,3,4,3,2,;;;3,4,5,4,3,;;;4,5,6,5,4.
2013/5=402+3/5
第2013个数是(402+3=405)