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lnq205
2 năm trước
cho tam giác abc nhọn và ab<ac .vẽ tia đối tia ab ,trên đó lấy điểm d sao cho ad =ac .vẽ tia đối tia ac ,lấy điểm e sao cho ae=ab.m và n lần lượt là trung điểm của cd và be .chứng minh . tam giác adm=acm, tam giác aen =abn
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