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幻灯片 1

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... 讲解新课( 2 ) 例1、已知:如图,∠DAB=∠CAB,∠C=∠D 求证:AC=AD 分析:要证AC=AD,只需证明 ACB≌ ADB,根据三角形内角和定理和“ASA”公理即可。

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幻灯片 1