题目内容：

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 ⊙