1,6,7,12,13,( ),( )找规律填数
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1,6,7,12,13,( ),( )找规律填数
1,6,7,12,13,( ),( )找规律填数
1,6,7,12,13,( ),( )找规律填数
1,6,7,12,13,( 19),(20 )
18,19
偶次加五,奇次加一
18、19
18 19
(18). (19)
1,6,7,12,13,(18 ),(19 )找规律填数
问题:1,6,7,12,13,( ),( )找规律填数
解:把这些数分成2组
(1)1,7,13,()
(2)6,12,()
这两个都是等差数列,
(1)应该是1,7,13,(19)
(2)应该是6,12,(18)
合起来就是1,6,7,12,13,18,19
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1,6,7,12,13,( ),( )找规律填数
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