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AD平分∠EAC,理由如下:∵AD‖BC,(已知)∴∠B=∠EAD,(兩直線平行,同位角相等)∠C=∠DAC,(兩直線平行,內錯角相等)∵∠B=∠C,(已知)∴∠EAD=∠DAC.(等量代換)∴AD平分∠EAC.(角平分線定義)
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