1,121,441,961,1681,()。A.2401 B.2601 C.3721D.4961

作者: rantiku 人气: - 评论: 0
问题 1,121,441,961,1681,()。 A.2401 B.2601 C.3721D.4961
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答案 B
解析 数列各项依次是12,112,212,312,412,(512=2601)。 另解:二级等差数列。作差得到新数列120,320,520,720,(920),这是一个公差为200的等差数列。

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