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hoannguyen3007
2 năm trước
Cho tam giác ABC có góc A = 90độ và AB=AC. Kẻ đường thẳng d qua A sao cho B, C nằm cùng phía đối với d. Kẻ BD và CE vuông góc với d ( D, E thuộc d ). Chứng minh BD=AE, AD=CE
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