2019中考数学一轮复习第一部分教材同步复习第四章三角形第18讲全等三角形权威预测.doc

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1第一部分 第四章 第 18 讲1已知:如图,点 A, F, C, D 在同一直线上, AF DC, AB DE, AB DE,求证:BC EF.证明: AB DE, A D AF CD, AC DF,在 ABC 和 DEF 中,Error! ABC DEF(SAS), BCA EFD, BC EF.2.如图,在 ABC 中, AB AC, D 是 BC 的中点,点 E 在 AD 上若 BE 的延长线交 AC 于点 F,且 BF AC,垂足为 F, BAC45.求证: AEF BCF.证明: BAC45, BF AF, ABF 为等腰直角三角形 AF BF, AB AC, BD CD, AD BC C EAF C CBF90. EAF CBF.在 AEF 和 BCF 中,Error! AEF BCF(ASA)

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