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nguyenleanhminh1204
2 năm trước
Trên tia Ox lấy hai điểm A và B sao cho OA = 2 cm ; OB = 4 cm a, Tính AB b, Điểm A là trung điểm của đoạn thẳng OB không ? Vì sao ? c, Vẽ Oy là tia đối của tia Ox , trên tia Oy lấy điểm C sao cho OC = 2cm . Vẽ M là trung điểm của OC . Tính MA . Vẽ hình nữa nha
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