且AD=6AB=PA=5x=y/5-y由5-y≠6

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且AD=6AB=PA=5x=y/5-y由5-y≠6
且AD=6AB=PA=5x=y/5-y由5-y≠6

且AD=6AB=PA=5x=y/5-y由5-y≠6
代入计算得A15=15=1015α 15β=1515

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