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證明:∵△ACD和△BCE是等邊三角形∴AC=DC,EC=BC,∠DAC=∠ECB=60º;∵∠ACE=180º;-∠ECD=120º;,∠DCB=180º;-∠ACD=120º;∴∠ACE=∠DCB【加上AC=DC,EC=BC】∴⊿ACE≌⊿DCB(SAS)∴AE=BD…
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