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补全下列各题解题过程.如图,E点为上的点,B为上的点 . 试说明:

解:∵(已知)

                  ▲                  

                  ▲                  

                  ▲                                    ▲                                    ▲                  

又∴                  ▲                  

又∵(已知)

                  ▲                                    ▲                  

(                   ▲                  

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