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?
I 2P, 2r, 2s, 2t, 2u
II P-3, r-3, s-3, t-3, u-3
III P2, r2, s2, t2, u2
为什么我让P等于1，常数等于3的时候，第二个数列就不行了呢？
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发表于 2017-10-22 13:18:02
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