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連接AC,AD, AB=AE, ∠B=∠E, BC=ED, △ABC≌△AED,[SAS] ∠ACB=∠ADE, AC=AD, ∠ACD=∠ADC, ∠ACB+∠ACD=∠ADE+∠ADC, ∠BCD=∠EDC,(∠C=∠D)
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