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hoangmayy
2 năm trước
30 điểm lận đó trên tia Ax lấy điểm B sao cho AB= 6cm lấy điểm C nằm giữa A,B sao cho AC= 2 cm lấy điểm D nằm giữa hai điểm CB sao cho CD= 1 cm a) tính AD b) Điểm nào là trung điểm của đọa thẳng AB? Vì sao? c) Điểm D có phải là trung điểm của CB ko ? Vì sao?
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