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圖中與角BCE相等的角有2個,它們分別是:∠ACD(對頂角)與∠BAD∠BAD=∠BCE,理由如下:AD=DE,可得:∠DAE=∠AED又∠ABD=∠AED(同弧所對圓周角相等),則∠DAE=∠ABD因為在Rt△ABD中,∠DAB+∠ABD=90°在Rt△ADC中,…
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