求助----等差数列求和问题
已知等差数列｛an｝的公差为1,且a1+a2+...+a98+a99=99,则a3+a6+a9+...+a99的值是_____
人气：463 ℃ 时间：2020-04-25 23:04:59
解答
(-46+50)*33/2=66
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