Download ppt - 九年级 上册

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  • .O

  • AOBOAOBOABOABABAB

  • _____ _______________________;.

  • 1.ABCDO1AB=CD____________________________2 __________________________3AOB=COD_________________________4AB=CDOEABEOFCDFOEOFAB=CDAB=CD

  • 2.ABO COD=35AOE

  • . .: ,.

  • 1.

  • AOCB

  • 2.AOB=100ACB=___1.X C C D B