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问题: 按规律填数

6.13.27.49.(  ).121.(  )

6.15.38.65.106.(  ).(  )

解答:

解:(1)各项之间的差:7```14```22```31```41````52
各项之间的差:`````````7````8````9````10````11
所以6.13.27.49.80.121.173

(2)各项之间的差:9``23``27``41``45``59```63
各项之间的差``````14```4``14``4```14```4````
所以6.15.38.65.106.151.210