找规律30,15,25,15,20,15,15,( ) ( )15

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找规律30,15,25,15,20,15,15,()()15找规律30,15,25,15,20,15,15,()()15找规律30,15,25,15,20,15,15,()()1530,15,25,1

找规律30,15,25,15,20,15,15,( ) ( )15
找规律30,15,25,15,20,15,15,( ) ( )15

找规律30,15,25,15,20,15,15,( ) ( )15
30,15,25,15,20,15,15,(15 ) (10 )15

30,15,25,15,20,15,15,(15 ) (10 )15
奇数项每次递减5
偶数项不变

15.10