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解 2=2^1 -4=-2²;=(-1)×2²; 8=2³;=(-1)²;×2³; -16=-2^4=(-1)³;×2^4 32=2^5=(-1)^4×2^5 ∴第6個為:64 第七個為:128 ∴第n個為:(-1)^(n-1)×2^n
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