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已知:如图, , 说明 . 请你补全推理过程和空缺的推理依据.

解:∵(已知),

                  ▲                                    ▲                  ),

又∵(已知),

                  ▲                                    ▲                  ),

                  ▲                                    ▲                  ),

(等量代换).

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