Đề 3: Bài 2: Vẽ tam giác ABC biết AB = 3 cm, AC = 4 cm, BC = 5 cm. Lấy điểm M thuộc cạnh BC, vẽ đoạn thẳng AM. Hoi AM là cạnh chung của những tam giác nào ? cho mk hỏi , viết 40 độ như thế nào?

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