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首先要記住一個定理,角平分線上的點到角兩端的距離相等 因為AD是∠BAC的角平分線,且CD=3 所以DE=CD=3, 因為BC=8,CD=3 所以BD=BC-CD=5 因為DE⊥AB 所以用畢氏定理可得BE=4
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