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PMC 2010-11 Q11
Author:
Arthur Lee
題目十一
一張正方形的紙，正面是黃色，背面是藍色。如圖所示，可移動D點把紙的一角摺起，覆蓋部分紙的正面。如果未被覆蓋的黃色部分是整張紙的三分之一，DE應長多少？
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