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設每個正方形的邊長都為a 將兩邊緊挨著的兩個正方形組成的長方形按其對角線剪開,中間的一個正方形不剪,即可得到四個直角三角形,其直角邊的長均為2a和a;將此四個直角三角形的長直角邊與那個正方形緊靠,短直角邊與正方形的一條邊在一直線上,即可拼成一個邊長為√5的一個大的正方形
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