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vietanhskt1
2 năm trước
Câu 2/ Cho tam giác ABC và một điểm O nằm trong tam giác đó . Gọi P,Q,R lần lượt là trung điểm của các đoạn thẳng OA , OB , OC a/ Chứng minh tam giác PQR đồng dạng với tam giác ABC b/ Tính chu vi của tam giác PQR , biết rằng tam giác ABC có chu vi bằng 543cm KHỎI CẦN VẼ HÌNH , AI LÀM ĐƯỢC BÀI NÀY MÌNH HỨA 5 VOTE + 1 LỜI CẢM ƠN
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