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linhngoc00
2 năm trước
cho tam giác ABC có góc ABC và góc ACB. Trên tia đối của tia BC lấy I, trên tia đối của tia CB lấy J sao cho BI = CI. chứng minh: a, tam giác ABI = tam giác ACI. b, tam giác ACI= TAM GIÁC AJB. c, AB=AC. d, AI=AE.
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