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第一句看不懂,煩請哪位NN幫忙解答,thanks.
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p, r, s, t, u
An arithmetic sequence is a sequence in which each term after the first is equal to the sum of the preceding term and a constant. if the list of letters shown above is an arithmetic sequence, which of the following must also be an arithmetic sequence?
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OG對第一句的解釋是: r-p=s-r=t-s=u-t=c
想破頭,但是就是不知道它是怎麼得出的。。。有人可以幫忙解釋一下不? |
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