摇摆数列:64,24,44,34,39() 20,32,36.5,19

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摇摆数列:64,24,44,34,39()20,32,36.5,19摇摆数列:64,24,44,34,39()20,32,36.5,19摇摆数列:64,24,44,34,39()20,32,36.5,

摇摆数列:64,24,44,34,39() 20,32,36.5,19
摇摆数列:64,24,44,34,39() 20,32,36.5,19

摇摆数列:64,24,44,34,39() 20,32,36.5,19
36.5
依次执行后一项减前一项得
-40,20,-10,5
发现以-1/2倍递减
即2(an+1-an)=-(an-an-1);
化简后有2an+1=an+an-1
于是答案为(34+39)/2=36.5