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[几何] P为正五边形ABCDE外接圆弧EA上一点，求证PA+PC+PE=PB+PD

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hbghlyj Posted 2022-6-4 12:35

又见math.stackexchange.com/questions/1691850/gold … -in-regular-pentagon
artofproblemsolving.com/community/c6h1358259p7436840

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