a) Vẽ đồ thị của các hàm số (d1): y = -x + 4 và (d2): y = x - 4 trên cùng một mp tọa độ. b) Gọi A; B lần lượt là giao điểm của các đường thẳng (d1), (d2) với trục tung và giao điểm của hai đường thẳng là D. Tìm tọa độ giao điểm A;B;D. c) Tính diện tích ABD. Làm bài đầy đủ, vẽ hình rõ ràng, chính xác cao (có thể vẽ minh họa nhưng độ chính xác phải cao)

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