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maihuyen
2 năm trước
cho tam giác abc . trên nửa mặt phẳng bờ ac chứa điểm b . vẽ tia cx song song với ab . trên tia cx lấy điểm d sao cho cd bằng ab. gọi m là trung điểm bc. chứng minh ba điểm a,m,d thẳng hàng
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