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2 năm trước
* Em hãy vẽ hình theo các trình tự sau: • Vẽ đoạn thẳng AB = 3cm, • Vẽ đường trung trực d của đoạn thẳng AB, • Vẽ tia Ax sao cho góc BAx = 60 độ, • Vẽ tia Ay  Ax, Ay cắt d tại O, • Vẽ (O; OA), • Lấy điểm M bất kì trên cung thuộc nửa mặt phẳng bờ AB không chứa tia Ax. Sau đó, tính số đo góc AMB.
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