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phuongpt.yd1
2 năm trước
trong mặt phẳng tọa độ Oxy cho tam giác ABC với A(-1;1);B(3;1);C(2;4) a. tính chu vi của tam giác ABC và tính góc giữa hai vectơ AB,CA b. tính tọa độ trực tâm H của tam giác ABC
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