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cho tam giác ABC vuông tại A .Gọi O là trung điểm của BC .Trên tia dối của tia OA lấy điểm D sao cho OA=OD.Chứng minh:
a)tam giác OAB = tam giác ODC
b)góc ACD=90 độ và AB//CD c)BC=2.OA

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