B2. Gọi G là trọng tâm của tg ABC. Trên tia AG lấy điểm G' sao cho G là t/đ của AG' . a) So sánh các cạnh của tg BGG, với các đg trung tuyến của tg ABC. b) So sánh các đường trung tuyến của tg BGG' với các cạnh của tg ABC. Ghi đầy đủ , không chép mạng nha. Hứa vote đầy đủ ạ ^ ^

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