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  • 1. (2022七下·石城期末) 完成下列证明过程,并在括号内填上依据.

    如图,点E在上,点上, . 求证:ABCD.

    证明:(已知),),

          ▲      (等量代换),

          ▲      同位角相等,两直线平行

    C(                                                                                                              ).

    (已知),

                                                      ),

                                                                                                                                                )

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