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观察下列各组数的规律,在横线里填上适当的数.
①1,1,2,3,5,8,______,______.
②3,9,27,81,______,______,2187.
③1,4,9,16,25,______,______.
人气:124 ℃ 时间:2019-08-19 10:28:08
解答
①5+8=13,8+13=21
数列为:1,1,2,3,5,8,13,21.
②81×3=243,243×3=729,
数列为:3,9,27,81,243,729,2187.
③62=36,72=49,
数列为:1,4,9,16,25,36,49.
故答案为:①13,21;②243,729;③36,49.
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