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khiet000
2 năm trước
cho tam giác ABC có AB =AC .AD là tia phân giác của góc A (D ∈ BC). a/Chứng minh: ΔABC= ΔACD b/Chứng minh: D là trung điểm của BC c/Chứng minh: AD⊥BC d/Cho góc BAC=70 độ.Hãy tính số đo góc ACD
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