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證明:三角形ABF與平行四邊形ABCD同底等高,所以它的面積為平行四邊形ABCD面積的一半 同樣的:三角形ADE也是與平行四邊形ABCD同底等高,所以它的面積也是平行四邊形ABCD面積的一半 所以△ABF與△ADE面積相等.
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