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quangduong123
1 năm trước
Cho đoạn thẳng AB = 4 cm trên cùng một nửa mặt phẳng bờ AB. Vẽ các tia Ax By vuông góc với AB lấy điểm M trên tia Ax điểm N trên tia Oy sao cho AM + BM = 3 cm. Chứng minh rằng các đoạn thẳng MN luôn đi qua một điểm cố định tính khoảng cách từ điểm cố định đó đến A và B
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