Question

求一道数学体的解法（初中的）要详细,要写过程

Answer 1

A2=1/(1-(-1/2))=2/3

A3=1/(1-(2/3))=3

A4=1/(1-3)=-1/2

所以可得A8=-1/2,A12=-1/2.

A2000=-1/2,A2004=-1/2(A的下标数字是4的倍数就满足)