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determine if each sequence is an arithmetic sequence.if the

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determine if each sequence is an arithmetic sequence.if the sequence is arithmetic ,find the common difference
确定每个序列是一个等差数列.如果序列是算术,找到它们的公差
1.1,1,2,3,5,8,.
2.1,2,4,8,16,.
求公差啊( ⊙ o ⊙
determine if each sequence is an arithmetic sequence.if the
设其通项为an,则：
1,
an=a(n-1)+a(n-2) (其中a1=1,a2=1,n>=3)
2,
an=2×a(n-1) (其中a1=1,n>=2)
再问： 公差啊！！！！~~~~(>_
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