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xuankutehoang
2 năm trước
Cho điểm O thuộc đường thẳng xy. Trên tia Ox lấy điểm A, sao cho OA=1cm. Trên tia Oy lấy điểm B, C sao cho OB=3cm, OC=7cm a) Tính độ dài đoạn thẳng BC, AC. b) Chứng minh rằng B là trung điểm của đoạn thẳng AC. c) Gọi M là trung điểm của đoạn thẳng BC. Tính BM, OM.
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