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Do DM ‖ AC hand BC to M ∴∠E=∠FDM,∠FCE=∠FMD ∵DF=EF ∴△CEF≌△MDF(AAS) ∴DM=CE ∵BD=CE ∴DM=BD ∴∠B=∠DMB ∵DM∥AC ∴∠DMB=∠ACB=∠B ∴AB=AC
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