Processing Math: Done
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幾何證明

  A1PPDA1PFDPF
同理
  B1QDEQDC1REFRE
  A1B1C1DPFREQDPFREQDEFDPFREQDPFREQ2A1B1C1=81

附件

20140611_2.jpg (32.18 KB)

2014-6-11 22:45

20140611_2.jpg

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