作业帮what number comes next in the following series?9,12,21,48,________.(129)如何推算出?
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what number comes next in the following series?9,12,21,48,________.(129)如何推算出?
what number comes next in the following series?
9,12,21,48,________.(129)如何推算出?
what number comes next in the following series?9,12,21,48,________.(129)如何推算出?
用第一个数字9, 9+3=12,这便是第二个数字
用第二个数字12,12+3*3=21,这便是第三个数字
第三个数字21, 21+3*3*3=48,这便是第四个数字
第四个数字48, 48+3*3*3*3=129
给点悬赏的分吧!
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