3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75找规律,大虾速回我

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3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75找规律,大虾速回我3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75找规律,大虾速回我3,9,-1,-4,

3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75找规律,大虾速回我
3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75
找规律,大虾速回我

3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75找规律,大虾速回我
答案是-75 :9是3的3倍 ,-4是-1的4倍 ,-75则是-15的5倍.是一个倍数等差数列.

答:是-75