数列an满足a(n+2) = [a²(n+1)-1] / an,其中a1=1,a2=2
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①充分性证明:
计Bn=b1+b2+...+bn
当q∈(-1,0)U(0,1)时,存在b,使Bnq>0时:
Tn=1*b1+2*b2+3*b3+...+n*bn
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