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  • 1. (2021七下·集贤期中) 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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