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一塊的面積是20×12 = 240 = 2*2*2*2 * 3 * 5 整個正方形的邊長肯定是整數,所以面積肯定是完全平方數.如果 2*2*2*2 * 3 * 5 * n是個完全平方數,那麼n必定是3和5的倍數,n最小是15,這時候面積是3600,邊長60,拼法就很顯然了吧
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