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题目1如图所示,△ABC的内切圆为⊙O,并且ED⊥BC,ED为⊙O的直径,连接AE并延长交BC于F,求证:BD=FC.
Problem 1 As shown in the figure, the inscribed circle of △ ABC is ⊙O, and the diameter of ED⊥BC, ED is ⊙O. Connect AE and extend BC to F, confirming that BD = FC.