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因為以AB為直徑的⊙O與BC交於D,與AC交於E所以角AEB=角ADB=90度因為AB=AC所以三角形ABC是等腰三角形因為角ADB=90度所以AD是等腰三角形ABC底邊BC的高所以BD=DC因為角AEB=90度所以角BEC=180-90=90度所以三角…
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