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如圖,由畢氏定理可知,正方形A與B的面積和等於正方形M的面積.正方形C與D的面積和等於正方形N的面積.並且正方形M與N的面積和等於最大的正方形的面積.囙此A、B、C、D的面積之和是為最大正方形的面積=a2.
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