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如果邊長為a的正方形紙片不能剪開,則只能是k²;(k是自然數)個正方形拼出 一個邊長為k的正方形. 如果可以動剪刀.則任意多個正方形,都可以拼出一個新的正方形. 舉個例吧,7個邊長為a的正方形紙片,大正方形是邊長√7a的正方形,把它 平分成7個長方形,把參攷題逆方向作即可.
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