问题
填空题
按规律填数:
1,3,9,27,81,______,______;
3,21,4,18,5,15,6,______,______.
答案
(1)81×3=243,
243×3=729,;
(2)15-3=12,
6+1=7;
故答案为:243,729,12,7.
按规律填数:
1,3,9,27,81,______,______;
3,21,4,18,5,15,6,______,______.
(1)81×3=243,
243×3=729,;
(2)15-3=12,
6+1=7;
故答案为:243,729,12,7.