3,4题,
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3,4题,
3,4题,
3,4题,
第三题要证明△AGD≌△FGE,首先证明∵△ABF≌△DEC,AB=AC,∠B=∠C,BE+EF=CF+EF,∴△ABF≌△DEC,∴DE=AF∴△AGD≌△FGE,∵∠ADG=∠GEF∴AD平行EF∴AD平行BC