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圖(1):1+8=9=(2×1+1)2;圖(2):1+8+16=25=(2×2+1)2;圖(3):1+8+16+24=49=(3×2+1)2;…;那麼圖(n):1+8+16+24+…+8n=(2n+1)2.故答案為:(2n+1)2.
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