写通项公式3,5,9,17,33.0,1,0,1.

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写通项公式3,5,9,17,33.0,1,0,1.写通项公式3,5,9,17,33.0,1,0,1.写通项公式3,5,9,17,33.0,1,0,1.分析:观察得出,前后项之差是2的次方An=A(n-

写通项公式3,5,9,17,33.0,1,0,1.
写通项公式3,5,9,17,33.
0,1,0,1.

写通项公式3,5,9,17,33.0,1,0,1.
分析:观察得出,前后项之差是2的次方
An = A(n-1) + 2^(n-1) (n>1,A1=3)

2的n次方+1
An=0,n奇
1,n偶数

2^n+1
((-1)^n+1)/2
楼上的两位,不行啊你们,错喽!!!!

(2的n次方)+1
1+[(-1)的n次方]