我们可以从数学上证明 1+1=2，但是如何定义 1 是什么。如果说是 0 的后继数，那又如何定义 0 呢？ In this case, adding 18 to the previous term in the sequence. 1/8 1/4 3/8 1/2 5/8 3/4 7/8 英寸。 this is an arithmetic sequence since there is a common difference between each term.
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