如图,在△ABC中,AD是角平分线,点E在AC上,DE=DB,求证:△ABC∽△DEC

2024-12-19 23:08:31
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回答1:

∵AD平分∠BAC
∴AB/AC=BD/CD
∵DE=BD
∴AB/AC=DE/CD
∴∠ACB=∠DCE
∴△ABC∽△DEC