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2 năm trước
Trên tia Ay lấy hai điểm B và C sao cho AB = 8cm, AC = 4cm. a) Trong ba điểm A, B, C điểm nào nằm giữa hai điểm còn lại? Vì sao? b) Tính độ dài đoạn thẳng BC. c) Điểm C có là trung điểm của đoạn thẳng AB không? Vì sao? Ai biết thì giúp tui với nhee , cám ơn
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