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在△ADF和△ACF中,AD = AC,∠DAF =∠CAF,AF是公共邊, 所以,△ADF≌△ACF, 可得:FD = FC, 所以,∠CDF =∠DCF . 因為,DE‖BC, 所以,∠DCF =∠CDE, 可得:∠CDF =∠CDE, 即有:CD平分∠EDF .
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