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dinhduy1456
2 năm trước
Cho tam giác ABC có AB<BC, trung tuyến BI, trên tia đối của tia IB lấy điểm D sao cho ID=IB. Chứng minh rằng: a)Tam giác IAB = tam giác ICD. b)Góc IBA > góc IBC. c)BI < $\frac{AB+AC}{2}$.
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