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Phanvan
2 năm trước
tam giác abc qua trung điểm o của trung tuyến am vẽ đường thẳng d sao cho B và C nằm cùng phía đối với d gọi AA',BB',CC' là các đường vuông góckẻ từ A,B,C đến d.CM 2AA'=BB'+CC' bài này trong sách nào vậy
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