数字推理题求解答:-1.5,2,1,9,-1,( )

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数字推理题求解答:-1.5,2,1,9,-1,()数字推理题求解答:-1.5,2,1,9,-1,()数字推理题求解答:-1.5,2,1,9,-1,()答案25做两次差后为等比数列,即-1.5,2,1,

数字推理题求解答:-1.5,2,1,9,-1,( )
数字推理题求解答:-1.5,2,1,9,-1,( )

数字推理题求解答:-1.5,2,1,9,-1,( )
答案25
做两次差后为等比数列,即
-1.5,2, 1, 9, -1,(25)做差
3.5 -1 8 -10 26 再做差
-4.5 9 -18 36 等比数列,公比为-2